It is a bit dangerous to use clevises at both ends of a push rod. If the clevis is not locked on to the threaded rod there is a danger of the pushrod turning during flight and unscrewing from one of the clevises.. In fact some contest safety checks will not pass a push rod with clevises both ends. With zee bends at both ends there is no rod length adjustment.

I use a clevis at the control end and a zee bend in the servo arm The rod cannot turn and I have adjustment.

Ed S