I just got mine back from B&T. I had the same problem as you describe. The tension knob would turn roughly 1/16 (read: not very much) of a turn and I did not notice any adjustment in the tension. I initially called B&T and they told me this was normal operation and it would loosen up. After about 6 months it had not loosened up at all. I called again and they said to send it in. I got it back in about 4 or 5 days and got a call that it was indeed not right. After getting it back, the knob rotates about 1/2 turn and there is definitely a major difference in tension. I would call them...Great CS BTW...