4 sheaves
at masthead and 4 at base on our 82 H36. I use the forward 2 for genoa and genaker, one aft for the main halyard, second aft is unused. We have a fixed wire topping lift. As I recall, the base of the mast sits on a support (tabernacle?), which is cast aluminum containing the four sheaves, two on port side, two on stbd. When I installed the genaker halyard, mast was in place. At the masthead, I fed the line over the upper forward sheave. The end of the line was attached to a series of lead weights on a length of fishing line to help gravity pull the line to the base. I also attached a small steel bolt to the end of the fishing line. At the mast base, we pulled out the shaft on which the two port side sheaves ride, allowing my mate (with small hands) to reach up into the mast with a stick magnet. The bolt and magnet hooked up and the line was pulled out the base of the mast. Seems odd that your H36 would have 4 sheaves at masthead but only two sheaves at bottom.Good luck.Mikes/v Charisma