Just send the whole tranny to Ape, or Fast by Gast!
They will most likely be able to repair it and undercut for you!
i would love to do that but im on a extremely low budget, im prolly gonna attempt to do this build myself
if your second gear isn't too f'd, it's less than 400 bucks to have every gear undercut by ape.
Plus,, cir clips, and shipping!FBG is $328 plus shipping as long as all you do is the under cut
Fast By Gast - High Performance Motorcycle Parts
Plus,, cir clips, and shipping!