lmao...I seem to have ooglie as my one-man-cheering squad
Go to the proshop and get 3k CO2 burst discs for a couple bux a piece. Walmart has them too but they are Brass Eagle pieces of junk (if yer in a pinch). Wrap 2 layers of teflon tape on the disc and thread it into the port the old one came out of.
older tanks used older 3 piece discs...the threaded plug, a nylon washer and a copper disc. Inspect the old burst disc and make sure all the pieces are out (if it's the older type) before adding the new disc.
New discs are "unified" meaning....the parts are all incorporated into the plug.