Frank34,
Per notes that I have from previous conversation with a Dillon long time employee:
"**Clean and polish the primer slide track with a flat blade screwdriver using a patch of Scotch-Brite pad. (not sure about lubrication, but I think it gets something?)
**Clean the “tube” (part #12995 – more specifically) and the hole that it slides up and down in of the primer rocker closest to the operator end of that part. It tends to get debris in it over time, and can cause it to stick in the down position and not allow the primer slide to retract!! If this happens, after the down-stroke is made and you start lifting the handle to complete the upstroke it locks up the primer slide and the whole press suddenly stops, then you are down until you disassemble and clean the primer system assembly ---- or worse yet, something bends or breaks!
**If the primer magazine plastic tip starts requiring frequent changing, it may be that the primer slide is no longer stopping just past center of the primer drop to the rear, but is in fact going too far rearward past center and may require a shim about the thickness of a business card (described as the addition of a washer between the “lower plate screw” #13995 and the “primer slide stop” #13108 to get it to stop at the perfect position) The description of where the slide should normally stop is just slightly REAR of center in rearmost position, not centered and not too far back."
I think that if I were you, I would look hard at the last paragraph. Hopefully this will help you too. Alignment of that slide is critical, per the guy at Dillon that I spoke with. The hole in the slide must go just past center to make the primer sort of "rock" into place as it drops, but it cannot go too far back either. I can't forget the guys' name that gave me that tip, but he had been there at Dillon for decades and knows his stuff!
Let me know how it goes. I hope these notes make sense to you............ John