I used the carbo ratchamatics for my spin sheets, and also carbo tie-light blocks for the tack/halyard system, as well as for my jib blocks (at the clew). I was wondering myself how they would hold up, especially the tie-light lashings to the spin pole and clew shackle. After a season of races no problem at all with the blocks or the lashings on the tie-lights. Great stuff in my book.