Yes, both ends are clevises...hadn't considered a ball end.

I was also wondering if I have the neutral/zero point wrong. Right now, the servo arm is zeroed at the flaps-up position (the arm slightly forward and a bit less than perpendicular to the linkage rod), with mid- and full-flap 25% and 50% of travel (these numbers give the 'book' extension distances).

Thanks for your help!