ok since this is on a good direction now...
Heres a good question. Lets say I have 2 polished total nv's, both drilled identical. Everything is the same on both, including top weight, etc. I use only one in competition to start with... The lanes seem to have some carry down after 7-8 frames and I cant get the ball to turn the corner. Could I take the other ball, which has been in the bag the whole time and sand it to say 1000 Abralon, then use it??? Or is this ilegal yet still...?