The inserts are pretty cheap. I've got 22 die sets and insertsfor all dies. Every time you buy a set of dies order the insets you need. I was out when I started 7 mm mag and just put one in and used one to resize my brass. Took it out to seat until I got more. They are sold in 3 packs for around 6-7.00 I finger tight but on bottle neck once my headspace is right I use a wrench and tighten a little more. The pin that pops up is spring loaded but if your insert is stuck just tap it with screwdriver handle or use channel lock to wiggle insert back in line. I like it but all my hand gun are on a turret now. You can be precise on. Turret. I'm loading for my 44 mag and using powder through die for exact powder each time. I trim my brass before loading. I don't trim 9 mm as I've never had one stretch. Your downloaded 45 probably will never stretch your brass either. My 44 only does first few firings. Don't donwload so low you get a squib. Bullet didn't exit barrel. Good luck. You will enjoy I'm sure. It's an addiction.