FYI a guy is remaking the air motors for about 3k, the lower pin some one is making for a 100$ each, dies no one is make to sell yet. I made a jig to make new springs but my shoulders are shot. Made about a 6 pins and 40-50 dies for myself. I missed seeing in your second batch of pics.There are 3 knock brands that look similar, M/W sued them and they ceased making them around 1952-3 Snap-on, Thor, Body-Master were the brands, made by Wilray manufacturing