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The box section tube turned out to be 120x120x5mm. Which is fine. I marked up a 49cm length. It will be parted length-ways after cut-off. I only managed to square one end with the jigsaw and a new, fine tooth, metal cutting blade. It was slow work despite trying lubrication. The teeth of the blade soon loaded up while using light oil. So I dug out the lamp oil ready for the next step.
A coarser toothed, aluminium blade would be better. The fine teeth and short blades are probably intended for mild steel. They clog too easily in the softer metal. I could use the miter saw but it makes a hell of a mess! The blade is also much thicker. Which wastes material unnecessarily. An ordinary hacksaw is so slow in 5mm wall thickness aluminium that it would be foolish to even try. A slow turning, cut-off saw would be ideal but economically unrealistic.
Rain in the afternoon stopped play.
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