right, you clamp the piston on an M3 screw, with a nut. Whack it in a drill, then using a knife, spin the drill up, and hold the knife at the angle you want and the material just comes away, they are only either Delrin or Nylon. once you have cut the desired shape, clean up any burrs whilst still in the drill, with some smooth emery cloth, then deburr the holes....
Free tapered pistons!!
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