I have DAce 7600 cranks on a UN54 BB and they recently started creaking almost every time I pedal. I found them to be a bit loose and tightened them some more, but when I tighten them, they creak too. Is this normal? Creaking from me pulling the spindle into the holes in the cranks with a bolt or is something really wrong? When I ride after tightening the cranks,the creek seems to have gone away except for one every now and then, but the creaking from tightening them still worries me.