Ditto the extended warranty - I seldom get them but it pays off on the HF tumblers. Give it some heavy use when new, the ones that fail mechanically usually die just over a month or two of good use. My first one failed at seven weeks - motor got extremely hot, couldn't touch the bolt for a bit, melted around the cover hole - pulled the warranty receipt and have used the replacement ever since.

Turn that wingnut until your thumb hurts! I failed once and like Force the hole became a larger oval. I added a metal washer on top of the rubber one under the lid, added washers on top of the to raise above the damaged thread, been good for two years. I have learned to verify that the wingnut does not move after 20-30 minutes then it can run for days if need be.