Nigel, I sent you a reply, but just incase you look here first...I used the Murrays instructions that I think Mike has quoted. I strongly suggest using stainless steel bolts with nylock nuts and washers instead of the rivets. I have done it both ways, and believe the bolts are not as apt to crack the fiberglass. I found them easier to install, drill the hole, drop the bolt in, climb under the boat with washer and nut... With the rivets you need another person under the boat to hold the backup washer on to prevent the rivet from pulling through the glass. I still needed another person to snug up most of the nuts, but it seemed a lot easier. DON't OVERTIGHTEN the nuts! I sail boomless, and while I have Murrays Positive Mast Rotation Kit, it does nothing to prevent over-rotating. I'm still trying to figure that part out. I used the Harken blocks with camcleats on the sliding traveler car from Murrays. They seem to work pretty well, though the lines can get tangled if your not careful. I almost went over last season, after a tack, the mainsheet was wrapped around the jib car, and I had to turn into the wind to untangle it. Probably it was my sloppy sheet handling more than anything else at fault. Good luck! Let me know how it goes! Brian