I have two of them mounted on the wall and each is set for different case lengths (.204 and .223) and I seldom have to adjust one until I move to processing my .308s...I've modified both to be used with cordless drill motors...
My case holder is one that uses a concentric cam latch lever and I'm not sure how it could seize up...They can be taken apart for cleaning, etc...If you can, take some digital or polaroid pictures as you are disassembling it so you will be able to put it back together properly...You may be able to find some photo instruction for taking them apart on the 'net...
Sorry to hear you had less than adequate response from Lyman, as I've always gotten good info from them...
