I am one of the few that still uses an RCBS Rock Chucker one station press....never have tried or used a progressive press. So I use a hand tool to prime my cases. When I started out I had a Lee cast zinc tool that had screw in shellholders (2nd picture below)...I graduated to an RCBS single "station" model (had two handles break on that one--they were of cast zinc) ....then eventually to a Lee Auto Prime #90230. With the later I had to use Lee style shell holder specifically made to be used with it. It broke on me twice; the second time Lee advised they have a New model and parts for the old one were unavailable...so I bought the new model. I've had it for a few months and primed thousand of cases---last night the "ears" on the plastic insert that guides the primer up into the shellholder broke off. The plastic used is a brittle polystyrene--same plastic used on a crystal Bic stick pen. IMHO a poor design as the "ears" are very thin and certainly not "beefy" enough top hold up with continual usage. Lee will replace it, but I am required to return the broken one to them. Or they will send me a free one, but I have to pay $8.00 for shipping. Has anyone else had this issue?