Carbon Fiber D-Tube Guitar Neck Stiffener
Patented #8962956
Carbon Fiber D-Tube Neck Beam

Carbon Fiber D-Tube Neck Beam

guitar neck brace cross section

Lightens & Stiffens Guitar Neck While Improving Instrument Tone!

The Gemini Carbon Fiber D-Tube Neck Beam™ has been specifically designed to stabilize instrument necks due to its unique D-Tube structure. The Carbon Fiber D-Tube Neck Beam replaces the truss rod, significantly increasing both bending and torsional stiffness and weighs less than the removed wood! According to experienced builders and regular customers, the D-Tube Neck Beam also enhances tonal qualities of the instrument by opening up the mid-range.

The D-Tube Neck Beam is available in 3/4" in both straight and tapered versions and 1/2" straight to fit virtually all necks. The 3/4" tapered version is designed to be used on thin necks while the 1/2" straight is designed for smaller necks such as a mandolin.

Installation is quick and easy. Simply cut a groove in the neck using a 3/4" or 1/2" core box router bit and bond the beam into the neck. The straight beams require a groove of constant depth.

For the tapered beam the groove is cut shallower at the head. The reduced depth of the beam near the head makes it ideal for thin necks.

The D-Tube neck beam replaces the typical approach of truss rod and carbon fiber reinforcement beams with a one piece insert. Cutting the groove for the d-tube is a much simpler operation and requires less labor than fitting a truss rod and carbon fiber reinforcement strips.

New D-tube Neck Beams and research about the product will be released soon. For more information on how to become part of the D-tube community, contact us.

The Ultimate in Guitar Neck Bracing!

TO ORDER, CALL 315-252-2559 OR

This product is designed to work with our 3/4" D-tube Neck Beam. This accessory was developed to reinforce the heel of stringed instruments overcoming fundamental design weaknesses due grain orientation.

This product is designed to work with our 3/4" D-tube Neck Beam. This accessory, similar to D-Tube Cradle, was developed to reinforce the heel of stringed instruments overcoming fundamental design weaknesses due grain orientation. Tee construction simplifies installation.

See how these instrument builders are using the Carbon Fiber D-Tube Neck Beam in their instruments...
Eric Aceto Christopher Cozad
Cozad Guitars

Christopher began building acoustic guitars in the mid-1970s. Today, Cozad Guitars produces a limited number of instruments for a select clientele from a shop located near Charlotte, NC.

Eric Aceto Eric Aceto
Ithaca Stringed Instruments

Immersed in the traditions of jazz, acoustic folk and blues, electrified rock and experimental music, Eric has been active as a session player, touring musician and designer of musical instruments for over 40 years.

Michael Griffin Michael Griffin
Rochester Philharmonic

Michael Griffin uniquely enjoys incorporating the insights of a professional orchestral musician in his making/repair of violin family instruments, a combination of pursuits he has maintained over thirty-plus years.

Harry Eibert Harry Eibert
H.F. Eibert Stringed Instruments

Harry Eibert operates a full service shop for the restoration, repair, and construction of stringed instruments. Specializing in vintage restorations with complete attention to detail and artistic execution of repairs. Custom instruments are designed and built to order.

David MacCubbin David MacCubbin
MacCubbin Guitars

MacCubbin Guitars offers high-quality, custom handcrafted, steel string acoustic guitars. Built for the fingerstyle player and using only the finest materials, each guitar is individually crafted to exacting specifications, based on years of experience and knowledge.

Scott MacDonald Scott MacDonald
S.B. MacDonald Custom Instruments

"My custom guitars are made strictly by special order. Each is designed around the needs, spirit and personality of the customer."

David Gage David Gage
David Gage Instrument Repair

David Gage is a one of the preeminent bass specialists in the world. He founded David Gage instrument repair in 1978 and has a shop residing in bustling New York city. David is multi faceted and caters to all bass players from jazz to classical to rock n' roll.

Ken Parker Ken Parker
Ken Parker Archtops

Ken Parker shook up the industry in 1993 with the Fly, the most unique solidbody design the electric world had seen in years. For more than 30 years now Ken Parker's primary passion has been advancing the art and science of archtop luthiery.

James Ham James Ham
Ham Strings Music

James Ham is a professional luthier dedicated to the repair, restoration and new construction of violin family instruments and bows. James Ham was the first instrument builder to install our D-Tube in a bass.

Dave Bertoncini Dave Bertoncini
Bertoncini Guitars

"My instruments are hand-built, one at a time, in my small shop, by me alone. I strive to be different by working one-on-one with my customers throughout the entire process, sending e-mail updates and pictures of the entire process."

Mario Lamarre Mario Lamarre
Mario Lamarre Luthier

Lamarre specializes in making string-quartet instruments as well as double basses (contrabasses). It was Lamarre's desire to eliminate the risk of cracks in the heel that led to the design of the D-Tube neck cradle.

Fred Pons Frédéric Pons
Kopo Lutherie

"My passion for excellence in instrument making has led me to use every material at my disposal; many kinds of wood, carbon fiber, resins, and metals to create superior innovations in comfort and sound."

Oberlin Bass Workshop Oberlin Bass Workshop

D-Tube installed in a bass at 2012 Oberlin Bass Workshop.

Joe Hendrick Joe Hendrick

D-Tube installed in mandolins by Joe Hendrick.

Mark Frazier Mark Frazier

D-Tube installed in Guitars by Mark Frazier.

Allred and Associates, Inc.
321 Route 5 West, PO Box 321
Elbridge, New York 13060
p: 315.252.2559   f: 315.252.0502