RE: Attaching pushrods to servo
IMHO, for .60 sized aircraft and below, making a 90 degree bend in the pushrod and attaching it two the servo arm using a snap keeper (e.g. E/Z Link [link=http://www.dubro.com/DU-BRO/DUB_CAT/DUB14.html]Dubro E/Z Link[/link]) is the easiest and least problematic way to hook up the servo. I have never had a failure with snap keepers. At the other end of the pushrod I have been using threaded clevises quite a lot, but lately I am using ball links more and more.
IMHO, Z-bends are a pain in the ...
/Red B.