I have an update on this.
So it turns out the shop just send the watch off to different repairmen, so JimInOz is correct that these guys are basically just jewellers.
They think the problem is I don't know how to wind watches properly, so they want me to come in every day and wind the watch in front of them.
I went in today and wound the watch as I normally do: I hold the watch by the strap (where it connects to the lugs) and started winding. After a few winds it stopped winding. The staff member then made it wind some more by using some force to wind it. He said I need to hold the watch firmly (index finger on back case, thumb on crystal) and use a bit of strength. I should point out I'm in my 30s and I go to the gym, so I'm not weak. The watch again stopped winding and he was able to make it wind more using some force.
I feel like I may be getting scammed here. I was always able to wind the watch if I forced it (for example, if I use a rag to get a good grip and use strength when winding), but shouldn't a watch wind smoothly?
What is an 'acceptable' level of force when winding a watch?
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