What material to use for non metalic pull-pull setup?
Spyder is stronger than steel of equal diameter. The package shows some good knots to use. Putting the spyder into perspective: Material:100% Spectra 50# test .011" diameter
IMO something like the Proctor turnbuckles with clevis (Tower)would be a good item to investigate. It has the eye for attaching the Spyder and the clevis (if sized right would give a thru pin attachment to either the control surface or servo.
Multiple wraps around your attach points will distribute the pressure and wear abrasion at the contact point.
I'm new to RC so hopefully others will share on other connector options.
mikenlapaz