J/30 Class Association Forums J/30 Forum The Boat, Sails and Equipment Main Halyard Sheaves

here are photos of current model available from Rigrite. Which I am supposed to change out but am having trouble finding a rigger here who has enough insurance to work at city dock.

I am thinking they just might be the same size as the turning blocks at the base of the mast. at least that would make engineering sense that all sheaves on the mast be the same size and all the pins the same size.

but then maybe that is too optimistic. also note they are grooved for wire.