So... As some may know, I have a bass I am almost finished converting to fretless. The 24 fret ebony board has been defretted and maple veneers installed in the slots. Some fingerboard sanding has been attempted, then stopped when uneven results became apparent. I have acquired some DIY tools, partially based on reading many threads here and elsewhere, and partially based on my recent unemployed status. What I have, so far: an 18 " aluminum carpenters level, a couple of machinist's rules, 3 strips of granite roughly 2 - 2 1/2 inches wide in 7, 8, and 9.5 inch lengths, and some 2x4s I can cut to whichever length. Am attempting to find a suitable surface to utilize to make a radiused block. Various threads suggest such tools can get the job done well enough, but definitely a lack of consensus looms. Also, no real agreements re: specific sandpaper grits and types (start with 100, start with 400, sand 'til the surface is nice, sand up to 3000 with wet paper, aluminum oxide is best, 0000 steel wool is just as good, etc.) I may be looking for hard and fast guidelines in a place too tough for rules, but is there a straight-forward process here? Looking for a dead-level board, no epoxy or coating. Would probably prefer the radius be saved, but flat fingerboards are new to me. Anyone offer pros/cons re: flat fingerboards? Sorry for all the questions, anything helpful to offer would be... helpful as well as greatly appreciated. Thanks!