I have a Sportco conversion of a BSA Cadet to a light  rimfire .22 sporter. It appears that they merely shortened the "legs (arms)?" on the lever to drop the breechblock so that the striker hits the bottom of the case rim. The block sits slightly lower and angled downward than the sides of the action near the breech, like it isn't rising completely.   I'd like to convert back to centerfire. I assume I could do this by replacing the lever or adding material back to the top of the "legs".  What would be an acceptable way to do that?  I'm  thinking of sweating on a piece of pre-hardened tool steel, maybe using Force 44 solder?  I don't have the equipment or experience to TiG weld the material back though I wouldn't be averse to sending it out to someone recommended that does. I imagine it would need to be rehardened after fitting. I'm thinking it might take .050 or so added to the legs. I'd glue a shim to the leg as a trial to be sure I added sufficient material so the block height come be adjusted to the correct height.  I've done some searching here but haven't quite seen this covered. I did find that some of you folks have a bunch of Cadet experience and expertise though!  I'd sure appreciate your suggestions.

I second that.  Get over to Rimfire Central as they have a section devoted to the Martini.  Pete Nagel has done some welding for me on Martini Breach Blocks and also noted what needed to be done after the welding as far as Heat Treating.  If you go the Weld/rebuild route give him a call.

Thanks for the input, fellas. I suspect replacing the lever is the easiest way - anybody have a spare they want to part with? John, I had the same idea regarding bushing the breechblock and have done that on several Rolling Blocks to clean up the block face and get to a smaller firing pin. I like that a lot better than welding or a screw.