Just a warning. This year it was time to lubricate the sheaves. With the mast on saw horses I removed the two bolts holding the head into the mast and pulled it out about a foot so I could disassemble the sheaves and lubricate them. Because of the radome on our mast it was oriented fore-aft, up down. When I was finished I pushed the head back into the mast, installed the bolts and verified that all the halyards were free and on the correct sheave. No problem. Almost. When I put the bolts back in, I managed to have the jib AND main halyard thread between the upper and lower bolt. These didn't bind until there was a load placed on them. 1000 "fishhooks" in the main halyard later I figured out what had happened. I wound up having to go up the mast and remove the bolts while tension was maintained on the lines. Shakey evolution at best. It appears all is well now. On the lower bolt I could see where the wire part of the halyard had chewed into the bolt! Good luck. Garry Elmer (I forgot to add my name at the top)