Proper way to operate 7750 chronometer functions?

[Observvito]

Hi.

A TD mentioned to me yesterday he comes across customers who do not operate the chronometer function properly and end up breaking it. I noticed the following within the 7750 User Guide at the top of this forum subsection:

'4. Don’t re-set the chrono with the seconds hand anywhere but between 10 and 2 on the dial.
The reset hammer can slam down very hard onto the heart cams for the seconds and minute counters. This force can cause the seconds hand to slip if the hand is sitting anywhere but between 10 and 2. Even genuine watches can suffer from this problem. A slipping center seconds hand is totally preventable by the owner, all you have to do is make sure you never reset your chrono between anything but 10-2. In addition, DO NOT push the chrono reset pusher (@ 4) while the chrono hand is running. It is also recommended that you resist the temptation to 'play' with the chronos too often - especially on an unserviced movement - as this can increase the chances of problems."

Are there any additional instructions for using the chrono functions on the 7750 that could help prevent breaking it?

 

[Plaasbaas]

If you want to play safe, just don't use it and you won't break it.

There are no guarantees I'm afraid. The 7750 is a very reliable and sturdy movement but has an ambivalent reputation due to complaints of users who ran into trouble using the chrono function.