Many tanks automatico for your reply I am really grateful for you taking the time to explain the process,
I had ordered the the tool prior to reading and it arrived today (pic below) my impatience got the better of me (again) and I could resist giving it a go
It’s a lot sturdier than the my old one with the outer jaws being supported and also a cut out for the case
Fortunately the bezel and crystal came off with no damage, I was very relieved.
I took the opportunity to photograph the Ruby crystal next to the one I received from Gleeve last week, you can really see the difference in height and how domed the Ruby (on the right) is.
Also measured them
Ruby
Gleave &Co T22
The OD is quite a bit different although I could remove a bit of material from it (did this with a t19 on a 5513)
Going to try the yellow t22 from Gleave &Co next as it’s inexpensive, will update in due course