The tapered blade helps separate the glue seam. It's flexible, so it stays down while you hold the handle safely off the guitar top.
The 3-7/8" (98.43mm) blade tapers .045" to .010" from handle to tip (1.14mm to 0.25mm).
Warm the glued area first, to help break the bond and protect the wood while using the tool. For repair situations when a hot knife is needed, use a hot plate to heat the blade.
Using a "swiss cheese knife" to fix the back on a 1923 Gibson
In this issue:
Dan Erlewine's working on great old Gibson L-1 with back problems. The challenge: how to fix this on a budget today, in a way that won't interfere with more thorough repair work in the future. Read more...