I have used these carbon fiber rods for years. They are always consistent and the service is spectacular.
I use Stewmacs carbon fiber neck rods in most of my guitars. It allows me to make a very thin yet stiff neck. Carbon fiber doesn't add any weight to the neck as well which is essential for maintaining the proper balance that a comfortable instrument must have.
The rods are very light, yet stiff, ideal for the flamenco guitar. I wanted to build a very narrow and light neck, with a thin fretboard, for a balanced instrument weighing under 3 pounds. The rods are hard enough to keep the neck from arching.
It is nice to have a convenient source for carbon fiber that is the right dimensions. I wouldn't know where to get this otherwise. I've put these in an old Kent bass that needed a little help and currently about to glue a bunch of them into a pair of acoustics. One standard with Port orford Cedar top and rosewood back n sides, the other a Baritone with bearclaw spruce top and crazy figured myrtle back, sides, and neck. The carbon fiber will definitely be a factor in how these turn out!
I agree with the other posts that it is no replacement for an adjustable rod. The dual action rods also offered by stewmac are great. We were making our own welding them up by hand but the ones you get here are absolutely worth the price.
The application was a 1995 American Standard Strat that the truss rod had separated from the anchor at the heel of the neck. I routed out the "skunk stripe", removed the rod and rebuilt from the back using two 1/8"X 3/8" carbon fiber rods on either side of the truss rod. The results are what I expected, a flat finger board with no more adjustment problems. To amplify on another review, I would use a truss rod in addition to the C.F. rods. I don't think the C.F. rods will get the job done alone.
Used the 1/8 X 3/8 rod in a fretless banjo neck. The strength feels fine so far but these do not replace an adjustable rod. After making the neck and checking carefully to make sure it was straight and flat, I put in the carbon fiber rod, without anything else. When attaching the finger board a slight warp developed. There was no adjustment as I had not put in an adjustable rod. Planing very lightly did take the slight warp out, but I would not use one of these without including an adjustable rod next time. In fact for a banjo I would not bother with this but just put in the hotrod adjustable support.
I built the laminated neck in this thru-neck over 12 years ago. I recently cut it out of the original guitar it was built into and designed the curly mahog custom in the attached picture around it because I loved the neck so much. I used three 1/8" x 3/8" carbon rods down the center and two 1/4" x .200" rods on either side of the center stack. What it produced is a very solid and stiff neck with INCREDIBLE tone and sustain from a super light-weight honduran mahogany neck...WILD! I would warn new builders to always include an adjustable truss rod unless you have the tools and know how to true in a non-adjustable neck correctly. I started using carbon rods 14 years ago in my guitar building and every neck I have built since then includes at least two of them.
I am starting to step up my builds quality and am very excited about these little Carbon Fibers.My current not yet complete Four string Blues build has one and my next Cigar Box Mando is gonna have one of those little boogers placed right in its little Ole Neck.
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