It's been a while since I adjusted my saw to the track and noticed there was a little more resistance as I moved the saw on the track. The front guide jaw adjustment turns easily but I cannot turn the rear guide jaw. I suppose I could use pliers but do not want to strip the plastic adjusting nob. Anyone know a way to make the adjusting jaw turn easier? I have cleaned around the area and that did not help. Seems like I need a penetrating oil but thought I would check here first.