Sam,
Its been awhile since I have messed with a mechanical resto on one of these caps. I don't remember how I went about it but I think it involved a stant cap. There was a thread on this a year or two ago. I think it may have been Budnate who was talking about scavenging the yards for these caps and fixing them. I'm glad the windex and steel wool worked out well. I use windex for almost everything, sometimes even glass
Sorry I could not be more helpful,
Jason