Ray, this is the elevation screw assembly that I will use on the Marsilly...
It was made from the antique faucet handle in the right photo. These were purchased from a company that specializes in parts for, and restoration of, antique bathroom fixtures.
I used the other handle to make the elevator for the Napoleon's field carriage. It's been in use for years and has never given me any problems.
The elevators are all brass, except for the threaded flanges which are stainless steel. I concealed the flange underneath a brass plate on the field carriage, I'll probably do something similar on the Marsilly.
I've pushed this bike over a mile before, but that was with a broken belt not a flat. With a flat tire, it doesn't move so well.
Luckily, I was literally right around the corner (I had to got to the hardware store) so I retrieved my portable air tank and was able to limp into the shop.
Today was a less eventful, but very long day. We are perpetually shorthanded. I didn't get to replace the tube in the tire until late this afternoon. Still, I was able to get home with enough daylight to cut the trunnion caps from the formed stock. They aren't drilled yet, but they don't need to be yet.
This material is a stainless steel shim for the front idler of a John Deere bulldozer. It measures .105" thick, and is wide enough that I can cut another, wider set of caps from it (for a "project to be named later"). I cut these with a cutoff wheel in an angle grinder. Due to the mess, I'll only do something like this outside, so it was a rush to beat nightfall.
Now that I have the trunnion caps for fitting, I can drill and cut the oak cheeks. This (at least some of it) can be done inside.