This a rather odd question about how suspension spring blocks were mass produced and assembled. I am interested in building up a lifetime supply of the small suspension springs used in the Kundo electric. This is a simple block with four brass plates riveted top and bottom over the suspension spring metal with an alignment pin. In modest quantities (i.e just making one or two), one can just used a few brass taper pins and grind the resulting overhang flush with the brass plates. This seems very wasteful in terms of sanding operations for any sort of jig set up so I am wondering how the manufacturer would have done it. I don't mind developing a few custom tools to stamp the parts out and assemble them in a jig, but I don't see an effective way to deal with placing and holding four rivets that are each less then 3mm in length.