cutting an o-ring groove

[Canard Gunner]

I am going to be making duck calls and need to purchase a jig or bit that will allow me to cut an o-ring groove inside the barrel of a duck call so that the pieces will fit air tight without exerting excessive force on the barrel. Any suggestions on what to use or what to do for this?

[MadMark]

Cutting an *inside* groove is next to impossible! There are special funny tools that can reach inside but you'll need a special jig. This is an "impossible" spot for an O ring as a ring contracts instead of expanding.

Much simpler to put a groove around the *outside* of the inner piece. The O ring will then slip into place and form a tight, but movable seal.

M