Compact Vertical Double Piston Extender

Well today I've got something a little different than usual.

This is a vertical double piston extender. I noticed there aren't a whole lot of double piston extender tutorials that work properly, atleast vertical ones anyway, and when I found one that did work, it could only be operated by button and not by lever. So I took it upon myself to fix up this design I found (See additional credit for original creator) and now it can be operated by a lever, both retracted and extended. 

I know from experience that double piston extenders are hard to create, so if figured I'd share my design with you all today.