Poljot 3133 Chronograph second hand re-setting 2s earlier each time

[mikepilk]

Thought I'd finally finished, but when re-setting the chrono second hand, it resets about 2s earlier each time.

I can't figure out what's causing it - sound like a wheel is one tooth out each time ?

 

[nickelsilver]

Either the hand tube is slipping on the pivot, or the tube is slipping in the hand (both frequently seen), or the arbor is loose in the wheel or cam is loose on the arbor (rather rare).

[praezis]

26 minutes ago, mikepilk said:

it resets about 2s earlier each time.

If a stable difference: hand not correctly set initially.

Frank

[mikepilk]

13 minutes ago, praezis said:

If a stable difference: hand not correctly set initially.

Frank

No, it's an extra second or two each time I reset.

38 minutes ago, nickelsilver said:

Either the hand tube is slipping on the pivot, or the tube is slipping in the hand (both frequently seen), or the arbor is loose in the wheel or cam is loose on the arbor (rather rare).

Fixed. The seconds hand was slipping - I just needed to push it on harder.  I've read that these movements are known for stripping the hand tubes, so I didn't push it on too hard.