So, doing the timing belt replacement, I notice when I tighten down the allen head bolt on the timing belt tensioner pulley, it doesn't move. Shouldn't it be free to pivot? I left it a little lose, pulled the pin on the tensioner, cranked it around several times to make sure the timing was on and the belt tension was even, then tightened down the tensioner pulley bolt - but seems to me that should be free to pivot....