Agree with previous posts
Our '88 h-35 has the Dutchman system and we're on our second mainsail. Like the previous person said about the "pockets" and the sail cover, if you have these you're almost there. The topping lift is essentially the small diamter lifeline cable, vinyl coated stainless cable, with two vertical lines clamped on. The clamp does not have to be hi-tech - what ever works. The cable topping lift is attached to the masthead (don't remember how) and comes down to near the end of the boom (say, withing about 8 inches) where a relativelly small eye should be installed with a crimp type fitting (very cheap, say, $1 for the crimp and another buck for the eyelet).The topping lift line is attached to the end of the boom, run through a small block attached to the end of the cable then back down to the end of the boom, through one of the sheeves, forward to the gooseneck, down to the foot of the mast, then aft to a sheet stopper. That's all there is to it.If you shorthand it is a very good system to keep the slippery sail off the deck and more or less contained on the boom for flaking. It's especially useful in lumpy seas in under adverse wind conditions.