At each end of the cylinder there was evidence of a plugged hole, ex cylinder drain cocks I presume but it looks like the thickness of flange at the end of the cylinder has been reduced, what happened to this bitza - weird.
IMG_5177 by
Andy, on Flickr
IMG_5180 by
Andy, on Flickr
Buffed up.
IMG_5185 by
Andy, on Flickr
The gland for the valve rod had an M10 x 1 pitch, I reckon the 1/4" bore male end union from the hydraulic brakes of a car had been used and the female part had been soldered onto the valve chest.
IMG_5211 by
Andy, on Flickr
As it was very worn I bought an M10 x 1 male brake blanking plug then drilled and reamed it to 1/4".
IMG_5227 by
Andy, on Flickr
IMG_5228 by
Andy, on Flickr
Here it is on a new stainless valve rod complete with a new half of the pivot.
IMG_5229 by
Andy, on Flickr
Reassembled with brass dome nuts and given a whiff of compressed air.
Buffed up it's looking better but there are still several issues to be corrected. The bent crankshaft is pretty bad and may have to be replaced if careful hammer blows don't straighten it. A new valve chest will be required because bodged/oversized holes around some of the studs have left almost no surfaces for the cover's gasket to seal against so it's leaking air at quite a rate.
It would be a bad idea to steam it with such a leak.
Andy