Mention, in an unrelated thread, of old Sidchrome tools and their quality made me think of this. If you spend much time working on machinery of uncertain history, with a miish-mash of imperial, metric and Dog-knows-what fasteners, a hugely useful tool to have in your stash is a Pre-WW2 BSA bicycle spanner. They're an unimpressive little thing, about 100mm long, with some sort of dark surface treatment on the steel, with four different sizes of jaw. Two ends, with two jaw sizes per end. One is a smallish square rather than anything designed to fit a hex. 'Sgot BSA forged into the shank. Appearances can be deceptive, though. Thanks to some long dead Brummie genius, the little bugger will fit pretty much anything you can throw at it. Not perfectly, perhaps, but well enough to get a grip on that heavily corroded, paint clogged, or just plain weird non-standard nut or bolt. The quality of the steel is something else too. I'm convinced that extra terrestrials visited the English Midlands in the early part of the 20th Century, because I'm pretty sure that materials this good simply weren't available to such primitive cultures . Anyhow, if you ever see one in a secondhand shop, at a garage sale or even with a vintage tool dealer who hasn't been enlightened to the wonders of this little bit of kit, buy it. You won't regret it.