[Toothsmith]

Yeah that's my problem. I'm rebuilding this nice W & C Scott hammer gun, thought the checkering was worn until I stripped the stock revealing nice 20 lpi square groove, flat top checkering. Repaired the crack and can just refinish, except for what some chimp with a checkering tool did to the forend. Thought you might have a source for square groove cutters, can't seem to find them at the usual sources. Might have to go the route you did with the Trojan, very nicely executed and not many could tell the difference. Besides square groove checkering kinda scares me, zero margin for error.