I'd like some advice from anyone who has had experience fixing a fingerboard with string ridges. What I have is some slow CA, and I'm tossing up whether or not to add in some wood shavings and possibly pumice to create 'micro-shavings'. I don't really want to sand the fingerboard, but I do have some Blackwood that may work in nicely. ....................... Optional: ....................... Some background: I was the unproud owner of an Ashbory rubber-string bass which had to go back because it was rubbish. I started building my own short-scale, but realised it would be a very long time before I got to actually play it, so long story short, I bought a Cort B4 fretless, a wonderful bass. I got it home Thursday. Thursday night I noticed some superficial string ridges, mainly along the E side. I called the shop the next day and again, long story short, one of his contacts said he'd had a Rosewood fingerboard all his life and never had to have it repaired. Not much help there. Seriously considered flats, semi-flats., etc... watched lots of videos, did lots of reading. Realised, soon after, the following: Round-wounds are more aggressive to fingerboards A slap plate/fret thingy would be a good idea The action was NOT set up, contrary to what I was told on the phone. The combination of working really hard on the Ashbory and the terrible action/set-up had caused me to work the strings into the fingerboard over and over again. I figured this out today, most of you probably know it already: you hold a note, it's a bit flat, you roll up, it's a bit sharp, you roll back. All the while your finger is grinding harder and harder into the string to control it (and flattening out) to oppose the bad (lack of) set-up. And on top of that, the pickups are misaligned and giving an out-of phase signal which also varies depending on where you pluck (one's sharp, the other flat). I've done most of the set-up, barring the nut, which I'm saving for a calm and collected moment. I'm also thinking that putting a little superglue on the Rosewood wouldn't be too bad, tonally. Especially if I could mix in some hardwood.