hi gents, I need to climb up my mast to replace the nav lights and wind vane I haven't done this before and I don't know anyone who has.My question is can I use the jib uphaul to raise the mainsheet block to the top of the mast and use the bottom block attached to the bosuns chair to raise myself up the mast. This will give me a 4/1 ratio the rope will pass through a single sheave and back to my winch. I can use the spinnacker uphaul attached to the bosuns chair as an extra saqfety line. OK or foolhardy.