Hi Jo.
The running, or trying to get running has always been my favourite part of any build. Looking forward to seeing the video.
Having spent many years in the company of vintage machines it makes me wonder if those fixed Brass bushes in the support arms were there originally? The “ bell crank “ seems to have sufficient bearing area and if the horizontal pivot were fixed solidly it wouldn’t ride out. An internet search didn’t find any period photos of this particular Bailey model so I guess we’ll never know unless the model was made from works drawings?
My search did highlight a Robinson patent however, a vertical design that I wasn’t aware of previously. Built by Frank Pearn of Manchester. A name familiar with pumps and steam engines.
Cheers Graham.