I made it twice in the past
twice very strong alergic reaction at the wood or wood conservant
(grade fever and rash, intravenous corticosteroids and calcium)
for the future I will use
https://www.cromwell.co.uk/images/product/TFF/962/TFF9623831B_0.jpg
figure does not represent the current state, it's a state before the last shot, after this bushing disintegrated,
the rest is to be removed, in the bushing is hole thru in firing pin size.
Remains only electrical erosion and I dont know how deep with erosion because dont know how thick are the bushing and what is correct design and sizes of bushing.
sorry for my english :-)
Is there somebody with experience with bushing change at 625 ?
I have experience only with hammer mounted FP 586 and 686
its same flat design or it is cup ?
by my experiences it causes more with B style designed bore in cylinder (for extractor shaft)
as guide for file using steel chamber insert with ball bearings
for ratchet fitting finish I use old sharpened hands
for 586/685 chamber insert with 10mm OD bearings
I think the problem isn´t possibility to shot with cylinder out, but possibility shot with unlocked center pin
(by contact of shooters thumb with cylinder latch or some technical problem)
I think the design what prevent this failure is part of safety
it is similar as 3th pin of the hand