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rotating shell plate bolt

 550b - New to reloading, loaded several hundred shells no problem.  Last 100 shells, the bolt that holds the shell plate in is rotating when advancing the stages.  Every 4 or 5 progressions, it locks up.  I have to loosen the bolt a little and then it is fine.  Inspected everything and it looks fine and clean.  What should I look for?

Raise the ram and look on the left side of the main shaft. You will see a set screw. Set your shell plate bolt to the correct tightness and snug that set screw to retain your setting. Do NOT crank in that set screw. It has a soft tip. If you are still unclear, go to the directions for a better explanation.

 

Slim

Thanks that was it,  it must have backed out a bit.

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