Extend 22mm solid driveline by about 200mm

[thvigil11]

Did something similar with a hydraulic pump on the front of an 8N, the angle method would work but can lead to some issues. Best way for me was to sleeve it like you are thinking.

Here is something in 4130 that would work.
http://www.onlinemetals.com/merchant...=250&top_cat=0

Here it is in A513 if you want to go with mild steel. (little bit higher yield strength)
http://www.onlinemetals.com/merchant...=283&top_cat=0

These guys are good in that they sell small quantities. 1 foot at $20 beats buying a whole stick. I've had a good experience with them in the past.