7 Best Rubber Spacers For Neck Pocket Alignment Tips

A wobbly or poorly angled guitar neck can turn a relaxing evening of music into a frustrating struggle with high action and buzzing strings. Neck shims—often referred to as spacers—are the practical, mechanical fix that corrects the pitch of the neck to ensure optimal playability. Understanding which material and style fits a specific instrument is the first step toward getting that guitar back into playing condition without needing a professional luthier.

StewMac Maple Shims: For a Precise, Professional Fit

For those who treat their instruments as long-term investments, the StewMac Maple shims offer a level of craftsmanship that mirrors the construction of the guitar itself. Because they are made from hard rock maple, they provide a stable, wood-to-wood contact point that does not compress or shift over time.

This is the ideal choice for homeowners who value permanence and structural integrity in their gear. While these require a bit more patience to install correctly, the resulting stability is unmatched for daily practice sessions.

The bottom line is that these are best for high-end instruments where maintaining the natural resonance of the wood is a priority. Choose these when a permanent, “do it once” solution is desired.

Fender Shim Kit: Easiest Fix for Your Fender Guitar

If the household guitar is a standard Fender or Squier model, the official Fender Micro-Tilt or bolt-on neck shim kit provides a foolproof, manufacturer-approved solution. These shims are designed specifically for the common neck pocket dimensions found in most suburban music rooms, meaning there is very little guesswork involved.

These kits are particularly useful for those who perform their own basic maintenance and want to avoid the risks of using makeshift materials like sandpaper or business cards. They provide a standardized angle that immediately addresses issues with bridge height and string tension.

Opt for the Fender kit if speed and compatibility are the primary concerns. It is the most reliable “plug-and-play” option for the most common guitar body shapes.

MusicNomad Shim Set: A Trusted, All-In-One Solution

The MusicNomad Shim Set is the Swiss Army knife for guitar setups, offering a variety of thicknesses in a single package. This is perfect for households that have multiple guitars or for the hobbyist who is still determining exactly how much tilt is required to clear up string buzz.

The advantage here is flexibility; instead of buying individual shims, the set allows for experimentation to find the perfect angle for each specific guitar. It takes the stress out of the repair process by providing every necessary thickness right out of the box.

This kit is highly recommended for households managing several instruments of varying ages and brands. It represents the best value for money for those who want a comprehensive, ready-to-use solution.

Graph Tech TUSQ Shims: Best for Improving Tone

While most shims focus solely on geometry, the Graph Tech TUSQ shims are engineered to enhance the vibration transfer between the neck and the body. These are crafted from a specialized material that mimics the resonance of bone, which can sometimes result in a clearer, more defined tone.

For homeowners who feel their instrument sounds a bit “dead” or muted, these shims offer a functional upgrade that goes beyond mere physical alignment. They are durable, easy to work with, and consistent in their dimensions.

Consider these if the goal is to improve the sonic quality of the instrument while fixing the neck angle. They are a smart choice for the discerning player who keeps their guitar out on a stand for daily use.

Allparts Hardwood Shims: A Simple, No-Frills Option

Sometimes, a straightforward, reliable part is all that is required to get back to playing. Allparts provides high-quality hardwood shims that excel at being exactly what they claim to be, without unnecessary branding or complex packaging.

These are excellent for the budget-conscious homeowner who understands that basic, sturdy materials are often better than overpriced “solutions.” They offer the solid foundation required for a bolt-on neck to stay secure during seasonal humidity changes.

Keep a few of these in the tool drawer alongside standard screwdrivers and Allen wrenches. They are the standard, no-nonsense choice for reliable repairs that get the job done efficiently.

Hosco Tapered Shims: Top Quality for Lasting Repairs

Hosco is well-regarded for producing components that meet the high standards of Japanese guitar manufacturing. Their tapered shims are precisely cut to provide a smooth, gradual transition, which ensures the neck sits flush against the body without any gaps.

For homeowners in climates with significant temperature and humidity fluctuations—which can cause wood to expand and contract—these shims provide an exceptionally stable platform. The tapered design is more effective than flat shims for correcting specific pitch issues.

Choose Hosco if long-term reliability and precision are the primary goals. These are a professional-grade product that will hold up for years of consistent use.

BigRock Brass Shims: The Heavy-Duty Sustain Solution

Metal shims are the unconventional but highly effective choice for those seeking maximum sustain and a brighter, more percussive tone. BigRock brass shims are incredibly durable and will not compress, even under the significant tension of heavy-gauge strings.

These are an excellent fit for players who want a permanent solution that adds a bit of “snap” to the guitar’s sound. Because they are metal, they provide a very hard, reflective surface for the neck mounting bolts to anchor against.

Brass is the right choice for the player who prefers a modern, bright sound and wants a shim that will literally last a lifetime. They provide a unique tactile and tonal difference that wood shims simply cannot replicate.

How to Know if Your Guitar Neck Needs an Adjustment

The most obvious sign of a necessary neck adjustment is “fret buzz,” where strings rattle against the frets even when played cleanly. If the bridge saddles are already as low as they can go and the strings still sit too high off the fretboard, a neck shim is likely required.

• Check the action: If strings are uncomfortably high above the 12th fret despite truss rod adjustments, the neck angle is the likely culprit.
• Evaluate the bridge: If the bridge is bottomed out against the body, a shim will allow the neck to sit at an angle that effectively raises the strings, providing more adjustment room at the bridge.
• Seasonal checks: Changes in temperature and humidity in the home can cause wood to swell or shrink, affecting neck alignment throughout the year.

Recognizing these signs early prevents unnecessary damage to the instrument. If these symptoms are present, a shim is often the most cost-effective solution before seeking expensive professional help.

Wood vs. Plastic vs. Metal: Which Shim Is for You?

Choosing the right material comes down to the desired balance between tone, stability, and ease of installation. Wood shims are the most traditional choice and are favored by many for their ability to blend seamlessly with the guitar’s own organic materials.

• Wood: Best for tonal consistency and a natural fit.
• Plastic: Excellent for ease of installation and budget-friendly, mass-market guitars.
• Metal: Ideal for maximum durability, added sustain, and a brighter, punchier tone.

Consider the environment of the home; if the guitar is stored in a room with fluctuating temperatures, wood or metal often provides a more stable, long-lasting solution than plastic. Match the material to the intensity of usage—casual players may prefer plastic, while frequent gigging musicians often opt for wood or brass.

A Quick Guide to Installing Your New Neck Spacers

Installing a neck shim is a manageable project that can be completed at the kitchen table with a few basic hand tools. First, ensure the guitar is properly supported on a clean, padded surface to prevent scratches.

Begin by loosening the strings significantly to relieve tension, then remove the four neck plate screws on the back of the guitar. Gently separate the neck from the body, place the chosen shim into the neck pocket with the tapered edge facing the bridge, and realign the neck.

Tighten the screws in an X-pattern to ensure even pressure across the neck joint. Once secure, retune the instrument and check the action height to ensure the adjustment achieved the desired result.

Getting your guitar back in top form is a rewarding process that pays dividends in both the quality of your sound and your enjoyment of the instrument. Choosing the right shim isn’t about finding the perfect, expensive brand, but about selecting the material and fit that serves the specific needs of your guitar and your household. Whether you opt for a wood shim for resonance or brass for sustain, taking this step ensures that every practice session remains smooth, comfortable, and buzz-free.