I've got a new BKKU...went to turn the T-stat the other day, thought it was at the bottom, thought it was at the top, before 1, was at the bottom, past three...turned the knob and it went about two inches past its usual stopping point. Then it had a bunch of play making it hard to tell where it was resting...thought I'd stripped it, but tightened the set screw and it got rid of the play...problem is, the knob is not at the same set up as from the factory...anyone help me figure out how to get the knob back to where it was originally? Also, my t-stat turned originally nice and smooth, but is kind of gritty now...anyone else. Is it normal for the cat bypass handle to just pull off with little effort, or should it be fairly firmly attached?? Too many questions...I know...Thanks!