what kind of plastic, flexible nylon push rod in a plastic tube running the entire length with all thread on each side, like Sullivan gold n rod.

a plastic/carbon fiber/fiberglass tube with attachments on each end? is there a plastic insert or did they give you some heat shrink tubing?

you have pic of the pieces. I come across 2 way to do it

1 there is a plastic insert. you push the metal pushrod or pushrods in a y configuration through the insert. put a 90 in the pushrod and push the end of the 90 through a hole drilled in the side of the plastic/carbon pushrod. this the [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB901&P=0]dave brown pushrod[/link]dave brown push rod

the other way is again put a 90 at the right length in the metal pushrod and drill a hole in the side of the plastic pushrod, then glue the end in the plastic to the plastic pushrod and secure the metal push rod to the plastic with heat shrink tubing. either way works fine