Thank you so much Bianchi, that’s very helpful! This brake came off an old Diamond Back Apex, probably 86 ish, but it sat in a box for decades. I was afraid I’d lost some pieces. Looks like your brake uses standard post mount brake pads; my pads use a threaded shaft. Originally mine had alloy pulleys, but I used them for something somewhere along the line. Fortunately I have access to an accommodating machinist; hence the brass pulleys it now sports. I think I would like to replace the pad mounting apparatus with a non threaded post style... finding brake pads would be so much easier!