Hi all, So as stated in an older post, I'm trying the hobby of watchmaking and am enjoying it thus far. However, as recommended here, I picked up a few movements that were not working or sold as-is. I picked up to Walthams, one of which is a 16s 1908. I would like to get a case for it but am not understanding how the winding stem interacts with the "female stem barrel". (sorry still learning my terms) I understand the stem slides into the square-shaped barrel but how does it "attach" to…

Waltham 1908 16s Winding stem Understanding