I had bought this from gumtree a month ago, finally got here from Sydney (1400 km away for the non OZ type amongst us).
It seems to work despite the current rust. A short term project. There seems to be a reasonable amount of paint on it, so I'll give it an initial/prelim clean up before deciding wether to hot tank it or go the electrolysis route.
I hit it briefly with a grinder wire brush, and the screw thread is not too bad. The rails are fairly pitted, but there is surface to be had.
I have a very nice Woden W4 and a good A78 to keep it company.