I an still getting used to my 60" PDL. The tension arm is riding on the beam disk that holds, in my case, the nylon cable. I have tried tightening the cord attached to the spring, using a much lighter weight, different spring etc. with no success. I am weaving a 12" fine wool sample, 32 epi, 2/26's, and tension is fine. However I don't think the arm sould be riding on the beam. I reread all of my AVL stuff, can't figure it out.