Like the others said, any experienced rod builder should be able to sand down a grip. There are mandrels that fit different sized holes in the cork. http://www.anglersworkshop.com/grip-...s-1-4-1-2.html He would slip the grip onto the appropriate sized mandrel mount it on his lathe, and it shouldn't take him more that 15 minutes to sand the grip to he proper size. Then he simply uses finer grade paper until he has the grip nice smooth. Now that he has assembled the rod, the process is much more complicated because he has to remove the reel seat and grip. His problem, not yours.

Jim Smith