hi all,
winter project on my nacra 5.2 is to try swapping my old 6:1 harken mainsheet system with an equally old ronstan 7:1 system from a tiger shark (18" paper tiger)

i see that many use "S" hooks to hang the top block from the boom hanger and was wondering what loads i should be calculating for buying an S hook and also for making a pigtail to bring the blocks closer together (so i can use the same mainsheet length), 100kg/220lbs? enough?