I'd like to preface my experience with this annealer as saying it is a great machine and no regrets buying it. I have managed to jam it a few times when a small (short) case such as a 6ppc or 6br drops and stands up vertically, resulting in the turning wheel above to catch on it, thereby jambing the mechanism and stripping a gear in the motor gearbox. Possibly my fault in not taking the time to get everthing "just right" before running a large batch. The first time this happened, I was quickly sent a replacement motor assembly for replacement. Even though I was advised the gearbox portion of the motor assembly is not serviceable, I took the damaged one apart anyway to check it out. Turns out if you strip a gear, the remaining four or five gears can be used to replace a stripped gear in the future. After doing this several times (I have annealed a kazillion pieces of brass), I decided to lower the moving aluminum strip that holds the brass while heating by an inch (which also invoved a few material cuts and a few small additional pieces added) Problem solved and only cost about $10.00 for the aluminum and a tap to put in a few screws. I still have to keep an eye on the machine in case of a vertically dropped case, yet I now have time to remove a vertical case before the wheel drops another case - whereas before, it would jamb before I could be fast enough to the off switch. On larger cases, no problems at all - even before my modification. If you get in a pinch, you can also repair some of the gears by first cleaning with spray gun cleaner, then silver soldering. A few of the gears are clustered with a little one on top of a little one and the little one breaks loose and turns independently of the larger one - which it is not supposed to do. The silver solder trick is quick and may get your machine back up and running quickly.