won't stay closed

[Jeff Christie]

My SC does that on occasion with 3 dram 1 1/8 oz loads. My shoulder can’t stand a steady diet of 3 dram shells so I am delaying getting it fixed. I load very light 3/4 or 7/8 oz. Loads and never have an issue. Score is not a big issue with me but comfort and pain is.

[Frank Good]

I assume an SBT "wear plate" is something along the same lines as the locking plate in something like a 101, Citori etc. and not shaped like the locking block in my Perazzi's?

[Researcher]

Parker bolting from a 1930 catalog.

Bolting from the 1930 Parker Bros. catalog.jpeg

The fit of the replaceable "bolt plate" is critical as well as the strength of the top-lever spring.