Case openers, torque, and how tight is needed?

I’ve been using my Pahawi case opener on my Speedmaster, which I really like.





I had my Speedmaster at the watchmaker, and noticed he was using a three-prong tool similar to this one, with a handle to open and close the case back:



When I got the watch home, I realized I forgot to ask him to record the movement number, so I went to open it with the Pahawi. It was really difficult. When I closed it up again, I was certain that, while firm, it was very likely not as tight as the watchmaker left it.

This type of tool I also see used by professionals. My guess? Again, it offers greater torque than the Pahawi.



So the question is, how tight is really needed? I guess there are torque specs somewhere, but in lieu of that, does my little palm device, without as much levels the others, close the watch case tightly enough?

320cNm

Must be the shortest most cryptic meaningful post I have ever seen.

I don’t have a torque wrench, so still interested in the subjective experiences of others who may have used one or more of the devices noted.

Sticky ball can occasionally work wonders without the risk of causing any damage,