I'm putting a 'finish' on a friends banjo that her late husband had built, but not "finished". I noticed there were a couple of splits running length-wise, in the ebony fretboard. They're only 1/4" to 3/8' in length. I don't know how long they've been there or if it happened recently. Any ideas on how to fill these splits? If these are from stress, I expect they will keep growing. He did'nt put a "truss rod" in the neck, but a metal bar instead.
Appreciate any advice.....
RatLer