Okay... I have a 10PC-SR w/ an Accustock. Drilled a couple holes in it for an aftermarket cheekpiece; decided that particular brand/model just doesn't do it for me and am going back to a Karsten. Unfortunately the hole spacing doesn't line up, so I'll need to fill and patch the holes. I was thinking of spraying some Great Stuff expanding foam (the stuff for around window and doors) in there and once it sets up, trimming/cleaning things up and then sealing with some epoxy, then drilling new holes for the replacement cheekpiece. Anybody here done this or something similar? Am I on the right track?