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Real Classic - - Bsa 650 Project -

It did pose me a bit of a prob­lem though. In a high stress area like that, I like to sleeve tubes on the in­side be­fore I weld them. Two rea­sons for that; it po­ten­tially adds strength (there’s an ar­gu­ment that a prop­erly welded tube should be as strong as an un­welded one, al­though I’ve never been con­vinced), but also it adds dura­bil­ity. I’ve seen orig­i­nal fac­tory frame tubes break in the mid­dle even where there is no weld­ing, it’s all a mat­ter of stress and vi­bra­tion. My the­ory is a solid slug in­side a welded tube tends to ‘soak up’ the har­mon­ics. But how to fit a slug tightly in­side the tube like this? In the end I used a bar to un­curl the in­ner tube as much as pos­si­ble, then made a ta­pered slug which I could ham­mer down the in­side with some force, which would push the tubes out tight against each other. Not per­fect, but I was also aware I’d be brac­ing the out­side as well, so I was happy enough this was an ac­cept­able so­lu­tion

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