A few RS600 questions

What i would do is hoist the sail to the top of the mast and cleat the halyard and then crank on the cunno. i would then release the cunno and pull the main back up to the top. usually works pretty well, but if your halyard is stretchy then that definitely isnt helping.

I've often found that the main halyard on the RS600 slips about 5 inches over the course of a sail. At the moment, it's held in place by a short Clamcleat riveted to the mast. Ideally, I'd like to add another Clamcleat, but adding it to the mast would require riveting it to carbon, unless it can be fastened any other way. Are there any other options? I've thought perhaps leading it to a block on the base of the mast and then to a cleat on the deck, but with a rotating mast that might affect how far I can get the boom out downwind. I'm going to replace the rope too, but the cleat simply isn't substantial enough to hold the halyard when I crank on the cunningham, making chop really tough.