Thanks everyone, I think I'll probably give it a go. As an apprentice I used various brazing methods from hearth/forge, town gas and air to OA, but that was a long time ago. Also used a carbon-arc "torch" to build a racer back in the 80s.
Bloke in the local gas suppliers said he's heard that oxygen consumption is much higher, but, still worth trying, I think.
Baby TIG on the wishlist, too.
Back to actual chassis (chasses?), I posted this scan on ESE for the crank picture but I thought the bolt in bracing was interesting and the apparent lack of support for the SA pivot a bit puzzling...
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