I race Afterburner, a 52' coastal offshore catamaran. My 20 races a year since 2001 are primarily in a multi class, w/a multi start, inside a...
http://ourworld.compuserve.com/homepages/Chris_AES/halydlok.htm Has pictures of the mastlock on my 52' cat with an 82' mast, and 1500 sq. ft....