I have had trouble with light, external-cam skewers on horizontal dropouts. I am not a masher, but still, it was easy for me to pull the front of the rear wheel toward the NDS and have it rub on the NDS chain stay. Stay with internal cam skewers like Dura Ace, Ultegra, etc. They will give you the compression you need to keep your wheel in place. You also want a model that will bite into the dropout. I say this as someone fully addicted to bicycle weight reduction. If I still had a horizontal dropout frame, I would run heavy-duty skewers on it.