In my youth (25-30 years back) when I used to avidly read Practical 
Classics, I distinctly remember a handheld bead blaster designed to blast 
smallish areas of bodywork (0.5" dia?). It had a sort of rubber surround 
that was held up against the offending area and it blasted all the 
rust/whatever away. The beads/grit were lost. I seem to think that it was 
self contained i.e. not requiring a compressor, and it wasn't terribly 
expensive. It's the sort of thing that Gunson would have made. Does anyone 
know whether such a tool still exists and if so where I could get one from? 
If not does anyone remember said tool and what it was called (or even have 
one kicking around in their garage)?

Cheers.