More on 58mm
Dave,If you are replacing because the sheaves wore out rather than because you want more sheaves, try this:A couple of years ago I replaced the sheaves in the original organizer (mine is a Merriman). I used Schaefer's #62-031. Works fine. You will need to save the original bushings. Also, before ordering, check that the center hole in the sheave is 5/16" to accomodate the 1/4" bolt plus the bushing.If your organizer is not a Merriman, it should still work if the center hole is 5/16" or Schaefer (or Harken) has another sheave. You can check vertical clearance and get depths for the sheaves from www.schaefermarine.com/hardware.Good luck,Dave Weir"Last Resort"