I also bought a spare with mine years ago, never had to use it. I have had to loosen the locknut and reset the rod a few times though. I deprime everything whether it is for the single stage (rifle rounds) or the progressive Dillon 550. The Dillon is finicky about having a CLEAN area around the primer transfer and seating area. Much easier to clean primer pockets out before any grit can get into the works to bugger up your day.