I've got both of them here Alvin but I doubt if they have anything smaller than 3/16". At least I haven't been able to find any online.
A couple of the vendors sell kits for twenty bucks plus another ten for shipping but they make them up out of 1/8" copper. I've got a roll of 1/8" copper here but being the purist that I am, tisk, tisk, I want steel as was originally used.
Denny Graham
Sandwich, IL