Simple but effective hand throttle. Very easy to clean, strip and paint. The grey body colour came off in a soaking of Evapo-Rust, not because of any rust, but I think because the coating on the body (zinc?) had developed an oxidized layer which had already separated the paint somewhat.
In this view, the unit after a night in Evapo-Rust to remove corrosion on the bolts, etc.. A very light brushing with a brass wire wheel and sandpaper, barely touching the surface, took off the grey paint plus the black on the other parts.
The undersides. The black paint on the arm, rod, etc, really just peeled off after the soaking, except for a couple of spots.
After further stripping and application of paint. The body was given a self etch primer, to hopefully prevent future lifting of paint. The 'face', from which the handle protrudes, was given a very light overspray of zinc paint on its outer surface only, which looks a lot like the original coating and may, according to some sources, help prevent future corrosion in the same way that galvanizing does.
A pretty simple unit, but it does the job and is definitely built to last!