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You would only need to make a pillar of sorts with an internal thread. Machine some relief sections around the outside for the glue to sit in, drill a big hole and fill it with lots of epoxy and push...

I think Norway has a mate that makes threaded spigots for the Versapod. From memory they are designed to screw into the swivel stud hole at the front of Blasers. They're pricey though.

EDIT:...

I'm going to make a spigot on the lathe and epoy it into the front of my stock. I like the threaded idea though. Maybe I'll look at that too.