May I throw in my thoughts on pushrods. For the past 35+ years, I have used nothing put solid pushrods of music wire with threaded couplers on the ends and clevises or the steel pushrods that have one threaded end. Nyrod outer tubes are fixed securely from close to the servo the their exit in the back of the fuselage and and a couple of spots in between to house the pushrods. This provides a slop free connection between the servo and control surface. It is simple to do and trouble free.
Good luck on the rebuild.