What the heck is the trick to not marring the hose ends upon assembly? Ive got them clamped in the vice(I've got some jaws on there that are not causing a problem. The crescent wrench Im using is leaving marks though. I even tried covering the wrench with numerous layers of tape and while that works for a couple rotations, the wrech eventually cuts through it. Do I really have to buy those annodized aluminum wrenches?