So, take a bit of your strongest, on hand wire. It should be about 1/16 - 1/8". Cut it at around 12". Fold it in half at the middle. Slide a keyring on the end (where it was folded) and twist the wire.
Take a hand drill or dremel and poke 2 small holes through the back end of the plunger.
Thread the two ends of your wire through these holes.
Hotglue these wires down. Be generous with the glue.
Fill the top half with plunbers goop and wait overnight. Once dry, then fill what remains with a heap of hotglue.
Drill a small whole in your stock and back half of your shell. Thread the wire though, and your done!
Edited by ice, 23 March 2009 - 04:42 PM.