I'm using some aluminum extrusion scrap for a small fixture that holds the BB shell and the rear dummy axle. The problem is that my bb post doesn't sit flat on the 8020. The extrusion is convex. This got me wondering if I can use it at all for a larger fixture.
Has anyone tried surface grinding it?
Has anyone found a flatter alternative? I was thinking square steel tubing might be straighter.
Thanks for your input.
rudimentary jigginess by jimn, on Flickr
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