I had a couple of problems at the start, the vibration was bad, turns out it needs to "bed in" for a minute or so, the wing nuts kept spinning off as soon as I fired it up, Ryan sent out some rubber washers to put behind them and it's stopped that issue, I had to tighten the bolts that hold the chain to the arms on inside the crusher a couple of times and also re-align the crusher unit a fraction where the bearing sits, done by sitting the crusher unit in a vice and getting the shaft as close to 90deg as possible, the shaft and baring pivot in the backing plate.
After these minor adjustments and bedding in time my unit is doing it's job well although I do 2 scoops at a time, stop the unit to shake out the dust and go again, yes the grinder does get pretty hot and hopefully this won't affect the longevity of the grinder and only time will tell though.
Hopefully some of that helped in some way but hopefully Ryan will get back to you to sort out your issues with it.
Personally I don't regret buying one, it does what I wanted it to do and I understand and accept there are some issues with getting it running correctly and I think they are only teething issues, I really like the concept and portability of it, if the grinder burns out anytime soon then I would adapt the crusher to my big ol' Makita and hopefully continue to keep the samples going.
For me it's a winner but yes agree I was disappointed at first, but as I said I've only done a few samples and time will tell on how the unit stands up. Used as a "small sampler" I can't see why it shouldn't last but if your grinder is getting so hot so quick then sounds like there's an issue, mine gets hot but only when it's doing a fair bit of work, I ware riggers gloves simply because of the thought of the moving parts in it, maybe mine does get really hot but the gloves hide it a bit.