Re: Filler material for overshemed woodstock?
For that kind of thing I use a paste made of clear epoxy glue and sawdust of the kind of wood you are working with. I wax the barrel or other contact part and wax aluminum foil and place it between the wood and the metal.
I use Devcon clear 2 Ton epoxy, not the 5 minute kind & I have done dozens of repairs with it. You mix fine sawdust with the glue, enough that it is thick enough that your paste doesn't run away.
A good idea to do a couple test batches till you get the hang of it.