I was doing a polar alignment last night when I noticed that when I used the azimuth bolt to line the pole star on the clock recticle .it would not quite get Polaris as I had tightened the left sided bolt it would not move any more so I loosened them both right up but it still wouldn’t let me get on Polaris by about 10 mil it seem to go more to the right than left . Tried losening one bolt the tighning the other but stil would go right to Polaris and I it was not screwing any more just needed a bit more play .never had this problem before any suggestions thanks