I recently bought a can of McLube for my mast track. I find that I cannot get all the slack out of the luff when I raise the sail. It is taught near the top but the last 4 or 5 feet are not. I'm thinking that the track is not slick enough (or maybe I'm not as strong as I was fifty years ago). I figured on attaching a line to the halyard and then attaching something at the same point that I would first saturate with alcohol and later with the lubricant. Raising and lowering that device should help. I don't want to reinvent something if any of you have already done this. Thanks.