Holding the crown in winding position, higher amplitude

[apandersP]

Hello. Can anyone help me explain this. 
 

I’ve got a watch with low amplitude. This is before service of any kind, so I’m not afraid of that yet. But when I fully wind the watch up, and keep holding the crown turned (like I would wound it, but of cause I can’t because it’s fully wound) the amplitude is visual a lot higher than if I don’t hold my fingers on the crown. Why is that? 

Edited November 30, 2024 by apandersP

[PaulRepairShop]

15 minutes ago, apandersP said:

Hello. Can anyone help me explain this. 
 

I’ve got a watch with low amplitude. This is before service of any kind, so I’m not afraid of that yet. But when I fully wind the watch up, and keep holding the crown turned (like I would wound it, but of cause I can’t because it’s fully wound) the amplitude is visual a lot higher than if I don’t hold my fingers on the crown. Why is that? 

Keeping the crown turned adds more power to the clockwise unwinding of the mainspring resulting in increasing the amplitude, which you noticed. 

[RichardHarris123]

Either the mainspring is set / it needs a service or both.  As mentioned, you're adding power.