[76Highboy]

The primer slide when interrupted will bind against the cam wire. My machine is an older one and so the cam wire bends. Yours must be the updated version. Either way the primer slide is locking up and when it sticks and does not slide back to pick the primer from the primer magazine tune it bends or places undue force against the cam wire because it cannot go anywhere except upward in the stuck position.

To figure it out run the press and when it binds keep the handle in position without backing it off and look at the primer slide. I am thinking one of several issues could be the problem.

1) Priming ram is extended up several thousandths causing the slide to stick.

2) The primer magazine tube is upside down and the primers are positioned tilted up... kind of like a tire on a car... as they index down into the load position the bottom primer will rest on it's side. This will not allow the primer slide to index far enough back to retrieve the primer. The reason you may not catch this is because the primer will suddenly fall onto the cup side... or the anvil side and the primer slide will retrieve the primer without fault. One indication of this is the primer seating upside down in the primer pocket.... dead giveaway. The fix.... make sure the side of the primer magazine tube has the machined edge facing down.

3) Primer housing is loose. Combine that with primer magazine tube being upside down and it will magnify the movement problem of the primer slide.

The problem cannot be rough edges on the primer slide catching because the force of the handle will over come that. Rough edges on the slide will only affect the return of the slide into the primer seat position (or when the slide is at rest for better terms) because the spring cannot over come the rough edges at times.

IMO the rollers are not the issue. I have never heard of this and once again a roller out of alignment cannot resist the force from the handle and it will move to full operating position. The strength of the cam wire will overcome rollers that are not true. The bent rollers will just not allow smoothness of the shuttle. Besides, the rollers would have to be grossly out of alignment and you would notice it immediately IMO.

I hope this helps.

Highboy