a couple of tips with the HF vibratory tumbler (based on my experience)
- pay the $10 and get the 2 year replacement plan (I've already cashed in on this so it was well worth the purchase price)
- the wing nut that holds the top on will vibrate straight off (no matter how tight you appear to tighten it). after it flies off, the top will then vibrate like crazy and inner bolt post will cause the hole in the plastic lid to open up to the size of a quarter or 50 cent piece.
note: you can avoid this design flaw by picking up a couple of 1/4"-20 (course thread) nuts and securing the top as such: after putting the rubber & metal washer combo over the bolt, secure the 2 nuts (tightly) and then the wing nut. the 3 nuts together will not loosen and fly off now.
- I've used both the medium and fine walnut shells but I think that the fine media does a better job (tip: use a 25% off coupon when purchasing media too!)
- follow Triumvirat73's advice and purchase some flitz to toss in with the media (about an oz with every 3-4 loads of parts (the gallon size jug is the best value for the price, but only if you plan on tumbling a lot of parts. otherwise, go for the 16 or quart size container)
- don't be afraid to let the tumbler run for 5-6 days straight. you'll be amazed at how "new" the parts look after tumbling continuous for 100+ hours
also, don't bother to purchase additional bowls to hold different types of media. its far easier to dump the media out into a bucket and change it out then it is to remove the bowl from the motor.