can be
no
yes
yes
The Parker term is "bolt plate". The 1910 bolt plate mates with a matching side channels bolt. The bolt plate is individually fitted into the barrel lug bolt bite recess and pinned. The bolt plate and mating bolt contacting surfaces are filed for correct top lever position. To retro fit a bolt plate into the barrel lug, the bite must be machined to form an inverted T shaped slot mating with the bolt plate.
The bolt plate should be first soft fitted then hardened. In the absence of hardening, the bolt plate/bolt will wear quickly and stick.
Bruce Day, Parker non expert newbie
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Threaded Mode