Thanks for all of the information. Here's what I've done so far: cleaned rims with alcohol, acetone, laquer thinner, scotchbrite pad, sandpaper. De-glazed pads; beveled leading edge of pads; put automotive anti-chatter compound between the pads and holders; tried toe-in, toe-out; tilting pads up and down; increase caliper spring tension; greased/oiled everything; whatever is causing it to squeal it sure beats the hell out of me! It's probably something simple (it usually turns out to be).