Just had a look on martin's MK Engineering site to see what the old get is up to. and once again I'm amazed at some of the things he makes. take a llok at his simple approach on a tube and box rolling machine
Tony

Link?

linky

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Looks sweet & that tube doesn't look like the indy ones that have the square tube deformed.

Wonder how tight a bend he can do?

Like some of the other pictures he's got as well.

looks canny like, might have a bash at making one meself.