Seamaster 396.1041 Quartz Stops when crown screwed in

Hey Again Everyone,

So I've recently purchased a vintage quartz Seamaster for a nice cheap price as a non-runner. The previous owner bought in new in the 80s and a few years ago had a "watchmaker service it".

It was a non-runner so I unscrewed the crown when it arrived as you do and it instantly kicked into life, however if I screw the crown in then it stops after 20-50 seconds.

On opening the watch it appears the movement was swapped to an ETA 255561 which doesnt bother me.

So now my mechanical brain says that the previous watchmaker didnt file the stem down quite far enough and by screwing it in fully it's interupting something... If i place the crown/stem into the watch but dont fully screw it down the watch runs very well. The seconds hand appears misaligned with the indices so i'm wondering how much of a great job the previous watchmaker did...

Wondering if the professionals on the group could advise any further on what to check in this instance?

I'm happy to file the stem a bit more or fully replace as the crown has some pretty hefty chunk taken out of it at some point.

Any advice, pointers or references for this movement would be great, or opinions on if the stem length would stop the movement running?

EDIT - I'm actually wondering if the stem is indeed the correct one for the ETA and if the crown is actually correct for this model?

Thanks in advance!

Yes, screws up right to the case which is what made me suspect that somebody hasn't quite set the length correctly. I've filed countless stems on the Cal 600/1000's so don't think I'll have much trouble. As the crown isnt in great shape i may just order a new stem and crown and be done with it. Thanks for your wisdom as always Archer 😀