While stringing poly mains (1.18, 1.23 gauges), I clamp the long side (dual action, swivel) close to the throat side frame and apply tension on the short side and then continue stringing the short side. I am noticing that the starting clamp position on the long side is marking the polys a bit. Is this pretty normal? I do unlock the swivel lever before releasing the clamp. Wanted to know techniques if this can be avoided?