Lego Pneumatic Engine - 5 cylinder inline (small cylinders)

I was looking for some Lego that I knew I had misplaced, and in opening one of the boxes I found the handful of special liftarms that I had made about three years ago for the sole purpose of making a proper 5 cylinder inline engine. The 1x2 halfheight liftarms (white in the move) have a 72 degree angle in one of the axle holes (actually 18 degrees, but who’s going to notice the difference). When I had them made I was clearly not ready yet, I did try but could not figure out a way of putting them to good use