Justin,
Sorry, I was probably unclear about what I meant by double purchase. Footys are generally toooooo small to accomodate pulleys - I simply meant a system where the linear “pull” of the servo arm is doubled by having the fixed end fixed, and the servo arm pulling the loop of the sheet so that it slides thru the hole in the arm (poor man’s pulley) and gives double the length of pull at the sail -
Sketch is attached of Gary’s method of doing this - his servo arm is aluminium (screwed to the servo disc) with a beautifully rounded hole for the sheet. This set up also includes a adjustor to set up the basic length for lots of different sails and mast pivot positions
andrew