Most likely old Webley is in good shape, better than you think. Before you start doing anything on .455 Webley, be aware that Webley locks cylinder similar way as Colt Python. So, to test is Webley in good order, cock the hammer, pull the trigger and hold it, while still holding hammer, and let hammer going slowly down. Still pulling the trigger with hammer down, now check cylinder lockup. Do that for each chamber. I bet you will find that cylinder locks solid on all chambers. I had a number of Webley revolvers, and handled even more, from very fine WG, to real WWI Mk VI clunkers, and none of them had a timing issue.I came into possession of an old Webley Mk VI that my grandfather carried in Europe...The cylinder lockup on this thing is a bit looser than I'm comfortable with, or I'd probably still be shooting it. Maybe there's some work that could be done to bring it back into good order. Just haven't explored it.
WARNING: NEVER SHOOT from Webley Mk VI standard ball 45 ACP ammo. I strongly suggest load your own ammo, using hollow base 455 bullets for Webley. For the best results, all bullets should be cast using soft lead, softer than wheel weight. See more on these two post:
https://castboolits.gunloads.com/sh...shaved-or-cut-Webleys-in-45-ACP-Auto-Rim*****
https://www.1911forum.com/threads/warning-for-shaved-or-cut-webleys-in-45-acp-auto-rim.447119/
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