My bet is the lock or brake is not fully releasing. My TK is not in front of me but very likely the locking lever is a cam which jams a piece of nylon or something against the main rail. Or it could be the knob's shaft is not turning freely in the hole through which it passes. Just guessing, but either of my hypotheses could be the result of someone lubricating some parts that should not have been. If you can't focus easily the camera is not going to be much good. Maybe its time for Marflex if you can't see how to disassemble it yourself.
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