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Hi Gordon,The problem is even the slightest amount of radial twist will loosen the set screws. I discovered the problem with my flywheels to crankshaft attachment. Now whenever I can I use some type of key to prevent the twisting action. That way the set screw just keeps the part from moving axially.I even do this with gears. For the key I just drill the shaft with an appropriate sized drill and put a pin in it.For the gear or whatever I don't want twisting I drill a hole axially along the bore. To accomplish this I make up a shouldered bushing made from the same material as the part and drill the hole through the shouldered part. This provides a true pilot for the drill. I then slip the bushing into the part and drill into the pilot hole. This will keep the drill right on the joint line. It's amazing that just that small of a pin will keep the part from twisting and the set screw just has to locate the part.gbritnell