This topic is in response to a comment in the custom steam rods discussion. I felt it requires a new topic because this is not about custom rods, though you can replace the 1x7 lift arms with Zepher's 7L with 2 holes. Anyway, I agree with the commenter that this little engine would look better with some rods. Because of its size, I'm thinking a Stevenson Valve gear (which is much easier to model). This requires 8 parts and is entirely Purist Approved too!
Part list:
Part# 15100 - technic pin friction ridges with pin hole - 2x (I used place because that is what I had on hand)
Part# 32002 - 3/4 pin - 2x
Part# 32065 - 7L lift arm
Part# 32073 - 5L axle
*optional - 3706 - 6L axle - to replace
Stick the 5L axle in the back of the cylinders, the 3/4 pins in the drive wheels.
Place the pin part of 15100 in one end of the lift arm. In the middle so that is sound freely.
Slide the pin-hole on the 5L axle and the other end of the lift arm on the pin. Done! Works even if motorized.
I will post a photo and video of it completed later.