We bought a 1977 Hobie Cat 16 and the main sheet is getting frayed where it goes through the cammatic. I want to buy a new main sheet, but am not sure what width or length to use. The block sets I see online are different than our setup. We have two single pulleys each on a separate hanger about 5 inches apart on the boom (the carrier in each looks like it will accommodate just under ½” line) and also has a double pulley block and cammatic on the traveler on the back of the tramp frame (same size carriers). All are stamped “Seaway”, but with no size or model number. The two pulley block has a total width of 1&7/8”. The main sheet currently in use is just over ½”, say 9/16”, which seems like it’s a little too big as it does not travel freely through the pulleys. The block sets I see online are much different. I'll try to attach a picture.

Has anyone seen a set-up like ours and will you please advise us regarding what type of rope to use for the main sheet? <img src="http://www.catsailor.com/forums/images/graemlins/confused.gif" alt="" />