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Here's where we are tonight, after a few hours in the shop. All the crud, rust and green paint removed, switch partially disassembled, and looking good for use on the machine.

Top Row, from L : Broken nipple, removed. Iron Union-elbow. Screws(4). Cast Housing. Rubber Diaphragm.
Broken nipple had sheared off in the receiver, both bits retrieved. The Diaphragm is a bit perished, but easy to replace, it's just plain 1/8" rubber/fabric/rubber and the local garagiste, M. Boitin, can supply a car-part for modification.

2nd Row, from L : Switch unit. Push Rod. Washers(3). Domed Piston. Outer Ring.

3rd Row, from L : Unloader Piston: Stem. Nut. Body. Remains of cork seal! Spring. Nipple. Union.
There is a part missing- the piston! This was probably a 5mm steel ball, and explains all the lube inside the switch.
The Union has a little seal missing and the pipe, (to the non-return valve) will be replaced.

Bottom Row, at L on box : Safety valve: Body elbow. Stem. Spring. Washer. Vent Cap.
This is in really good condition and only needs the ball end to be reseated with grinding paste. Re-usable!

Bottom Row, at R : Inside that 'ominous cast boss' : Stem. Spring. Captive bolt/flange/nut. Screws(2). Tab.
This was siezed solid, but eased up with oil. The Stem acts on the flip mechanism, and has a locking tab, so my guess is that this is the 'Off' trigger pressure adjustment knob. We'll see when I start the initial runs.

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