your not going to be able to do a pull/pull with that unit since it looks to have only one side for stearing(tiller style) the PP needs flexable wire leaders to bend when retracted.

if you were going fixed then a ball link in the pushrod would work just fine here is a basic example of my modified Hangar-9 Mustangs TW set up, the servo is mounted in the tail but the set up is the same.

you might want to invest in one of the Robart 121 units http://www3.towerhobbies.com/cgi-bin...?&I=LXET15&P=0 there plastic as well but have a yoke (2 sided) stearing set up, here is a example of how I configured mine using plastic coated fishing leader,single servo stearing,and rudder, air retraction.

might give you some ideas