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J
I guess I tapped the part that holds the wrist pin and used a screw to hold the piston on for what ever reason , both ways should work .
J
The piston is drilled and countersunk for a flat head screw , the screw attaches to another part inside the piston which the wrist pin attaches to . I hope this makes sense .
J
When I built this engine I found the best material for the piston was graphite.
