I am looking for a rotating joint 3

[knowlittle]

DRIVING rod: This rod is making a simple in-out movement. 4" (10 cm) movement.
DRIVEN rod: This rod follows DRIVING. This rod also rotates (2 revolutions).
Both rods are about 1" (2.5 cm) in diameter. End surface of the rods has a tapped hole, on the axis of the rod.

I need a joint that connects the two, transferring 4" movement from DRIVING to DRIVEN, allowing DRIVEN to rotate. DRIVING does not rotate. I can drill/tap additional holes to both rods. I can modify both rods.

 

[Nereth1]

Umm, am I missing something?

Ignoring the whole redesign thing, doesn't he just need a thrust bearing to link one reciprocating shaft to another, while allowing rotation? Double row tapered roller? Maybe just a deep groove ball lying on someones desk? You just need to let a machinist turn up a shaft and housing for a bearing in the morning, barely even need to give them any instruction.

Am I thinking too agricultural?