I used to make my own pistons, but now I pretty much stick to screwing around with off the shelf pistons. To make a piston from scratch you have to use a 4-axis mill or a special cnc lathe capable of eccentric turning. The mill isn't hard to come by, but it's really slow and the special lathes aren't used for much else besides piston manufacture, so no one has them.
My problem with giving away stuff on here is that I would prefer not ship the stuff (I hate the post office), so I ask that someone comes and picks it up, but apparently that is too much to ask............ :biggrin: