Took apart the new to me 1912 BSA and it was mostly good news. Rifling clean like a mirror. I have the original spring, see pic with the 3 rifles stamp. John’s book says this rifle would have a single spring. The piston and spring are in good shape. The leather seal is still intact but the screw that holds it on has been beaten by slamming into the rifle barrel. The impression of the barrel in in the screw and brass seal cover. See pic. Not sure if I should peen it back and kept it as is or replace the leather seal with a new one I already have, see it in the pics. Any thoughts would be appreciated.