Jacjac, Don's Hobbies sells a great pull/pull setup for different sizes airplanes, I think up to 40%. They provide a kevlar coated with vinyl cable and also 4-40 loops that will not cut into the cable.
I have used them for a few years on all sizes up to 35% and never had an issue.
ORIGINAL: jacjac
on giant scale gas, do u need to use kevlar for your pull pull system or is stainless ok? my concern is radio interferance