Thanks for the tip on relocating the main sail slug opening. Last year I bought a new mast and had the slug opening positioned where it normally goes on an M15. The old mast had it below the gooseneck. Little did I know that the past owner knew what he was doing. This brings up the question of why the slug opening was designed to be above the gooseneck which causes all manner of problems when reefing and just taking the main down? Does anyone have the answer to why the above gooseneck opening was chosen? If not, I'm going to close the current location in favor of the lower one. Rick, what did you use to close the original slot, and what did you use to make the new one? Do you have a picture of your new location? Norm Bundek M15 #172