I usually put a pad on a gun by doing the main part on a belt sander. Then, when I get close, see how it fits, then take it off, sand a little, then put it back on to see how it fits. Over and over. I have always been afraid of putting tape on one for the fear of pulling off the tape and peeling off the finish. I am presently putting one on a Grade 5, Model 12 and would hate to pull off part of the finish when I was done. But, I'll give it a try. Thanks.