Cartridge Neck crimp resizers

thingiverse

These are used to fix cartridge cases that have been deformed by people removing the projectiles from the cases. 6mm screws with the heads cut off are used to keep them aligned. Thread the screw into one side, use drill to slight open up the other part so that it sides over the threads.. Or get screws with smooth shanks. I use them in my 5ton bench vise. 100% infill PLA and I can use a cheater bar on it and they still haven't broken (at least the 20mm version hasn't) The different versions are tweaking the diameters of the hole, adding or removing a crimp ring. It does require you to have the projectile in the case to keep it from possibly folding the cartridge instead of forming it.