I've changed out most of my running rigging on my Cal 2-25 and I've left the hardest for last, the halyards. I'm trying to think of a way to change them without A. un-stepping the mast. B. Going up the mast. My halyards are (according to the manual) 3/8 yacht braid and 1/8 stainless steel cable. I was thinking, I could cut the shackle off the old halyard and connect (somehow) the free rope end of the new halyard to it, then pull the new halyard up over the sheave and down through the mast and then out of the slot in the side of the mast. What I don't really know is how much clearance there is at the masthead sheave and whether or not the 3/8 line will pass over the sheave that normally holds 1/8 cable. Does any one have any experience with threading a new halyard this way?