Hello all, my 1987 M-17 came with rope/steel wire halyards when I bought it about 15 years. About 11 years ago I decided to replace the halyards, and I used StaSet 5/16" line going both up and down the mast. Unfortunately I did not replace the masthead blocks (sheaves?) that the old steel cable went through, and over time the halyards became frayed. Now one of them has become unusable. I need to replace the halyards, and was wondering if 5/16" line is not overkill. I was hoping to conduct an unscientific poll: what size halyard line is on your M-17? I was thinking of going down to 1/4" to make the line run smoother through the blocks. Also, does anyone know what size masthead blocks do I need to replace the existing ones that are intended for wire? Is there a good source for these? Thanks,Andrei.