1675 Advice

[met]

having recently bought a watch from this forum, it arrived this week. sadly the crown will not screw down and stay down, just about catches then pops. Assume and hope that the crown has stripped and not the tube.  I removed the stem and crown and broke it all down but its hard to tell which has stripped. more likely to be the crown i assume though.    Anyway , had a look on ebay and there are a few available but wanted to ask your advice, its a 21J watch i believe, so i can retain the stem and tube hopefully, any recommendations where to source a good rep 5.3mm crown though? 

 

I would sent to my friend RA but he currently has my 5512 for some work, so believe it will be some time before i can get this 1675 fixed and really want to wear it. the seller has offered some money towards the repair, so keen to keep costs low if i can having already spent a lot on this watch which was a nice to have and wasn't really budgeted for! haha

 

thanks in advance.