That looks like it is the flap? For flap extension, I do not like the flap being pulled by the servo. I’ve about lost a jet this way, due to 500oz servo failure. Fortunately, high enough to recover. I modify all flaps to be pushed from the top inside flap joint. It is an extremely easy mod that reduces servo, pushrod, link failure. The servo arm rotates on the inside of the top skin. This way the short servo arm is almost straight inline with the flap pushrod, and creates less fulcrum torque on the servo.
As others have said, using titanium pushrods, 6/32 threaded rod with a carbon fiber tube sleeve.
I simply cut a slot in the flap inside leading edge. I used G-10 with 9462. I beveled the control horn to fit as deep as possible into the flap.
This is the original setup as per SkyMaster.
You only see the control horn when flaps are extended.