Originally Posted by
Farsight
Hi Abe, (and this being my first contribution to the BBS good afternoon to all). It looks as though the guys have pretty much answered your questions, but here is my two pennyworth. Looked inside my Brittania last night (ser. no.1771 .25, seesaw sight, 36 1/2" long) and the mainspring is 8" long, probably more when new. Super gun, more than a century old and shoots like new! Good luck with yours -- fix that piston, you won't regret it.
Best wishes: Mark.