Until you fire a 577/450 shot gun shell in the chamber you do not know if you have a problem.
These chamber inserts have a history of problems in Martini chambers.
I have made a good deal of money extracting chamber inserts out of Martini Chambers.
The problem isn't the quality of the inserts. The folks making them, make a high quality top of the line product.
The problem is the Martini chambers; they are non standard. When these guns were made there was no standard shoulder length or shape. The chamber Inserts are made to a fixed standard and the shoulder of the insert can can bump the shoulder of a short chambered original and not allow it to chamber properly.
The other thing I have notices is that the inserts don't seal the chamber that well, again becsasue of the chambers non standard size and when a cartridge is fired gas blows bay and builds carbon in the neck and shoulder preventing the insert from being properly seated in subsequent loadings.
I suggest you get some CBC 24 gauge cases reformed to 577/450 and load them with buck and ball before you decide you need ot fix anything. Thes bass cartridges will porperly seal the chambe when fired.
Replacement Martini lock screws are available from Steve Stonehill at Evans obsolete screws.
I am not sure what you are talking about when you say "front bottom center section of the finger lever (the thin part that I guess cams the cocking lever) is torn on both sides," can you post pictures? Be glad to help.Information
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