If it is any consolation Jeremy, a few months ago I hacksawed through an 4", 102mm solid aluminium round bar, for a tripod pier extension project. Took me about 2 hours all up and used an 18T blade and the occasional spray of WD40 to help lubricate the cutting action. Was good exercise for the arms and shoulders, so it can be done with perseverance and a bit of a rest now and then.
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