I have an Auto Prime tool that I've been using for 15 years. It has broken twice in that time. Both times it was my own fault for not keeping it properly lubed. Parts are cheap and Lee is excellent to deal with. In both cases, they sent me the part ASAP and billed me for them. Now thats trust!
Fear not, I'm sure Lee will be in contact. If not, e-mail them again and request them to send the parts and bill you for it.
BTW: proper lubing of the Auto Prime is to apply a small amount of grease at both ends of the connecting rod and the lever pivot. Do this and it will last pretty near forever.
Politically, Fashionably and Aerodynamically Incorrect!