A spare primer shuttle in each size. The only spring you can't easily get at a decent hardware store is the case retainer. I also put a lockwasher under the shell plate bolt to help keep it from backing out. Keep a small brush handy to occasionally brush any debris from underneath the shell plate. Good lighting is a nice thing to have so you can give each case the hairy eyeball for powder level check. Go look at inlinefabrication.com for some nice accessories for your press. Just a happy customer.
"Of all the things I've lost, I miss my mind the most." A. Brilliant