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The problem appears to be to much tolerance in the shell plate. The hole is almost square, allowing the primer to rotate. Add to this the tolerance necessary for the shell plate to rotate freely and any slight perturbation will cause the primer to rotate. Even the slightest misalignment in the shell plate will cause the primer to rotate. The shell plate position is determined by a detent ball and spring. Not exactly a precision method of location. The spring is not strong enough to positively locate the shell plate, yet the spring is to strong to allow the free rotation of the shell plate. A no win situation and a certain reason for problems. In addition the p[rimer plate must rotate freely and align perfectly, which it does not. It tends to hang up on the mechanism that causes it to rotate. All in all it is a system that does not work reliably with the parts used. I suspect that it is a case of tolerance build up and parts that are not precise enough to do the job;. Bottom line, it don't work, for whatever reason. Pay me my standard rate of $200 per hour and I will give you a definite answer, pay more and I will give you a solution. But I suspect that they already know the answer, they just do not want to implement it due to cost.
PS I am retired so make that $500 per hour, not $200
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