I just got a fretless neck off of eBay for my Jazz Bass. It's a mid 80s J neck (factory fretless so no line markers or nothin), I had to do some little "repairs" to it - I had to drill new holes for the tuners because the 80s tuners must be larger than the newer ones (i had to transfer the tuners from my old neck to this one), and I had to hammer the ferrules in and sand a little off the sides of the back of the heel to make it fit tighter. But now the problem is the strings are right on the heel of the fretboard, so I can't play any notes. I've loosened the truss rod a bunch and raised the action almost 4 turns but it doesnt seem to do anything. I got the neck from WA (used) so it may be a climate change problem (I live in PA) but I would think the truss rod may fix that (I let it sit for about 3 hours). It looks like the original owner ground down the nut slots a little for lower action, but I dont think thats the problem with the strings hitting the heel...since there's enough height at the 1st fret. I was wondering if anybody had any suggestions???