Just to show how I make a lot of discs all the same size. I start with a length of 5mm plate and mark my circles, cut rough in the bandsaw, trim around on the notcher, drill a hole in the centre to fit a 1/2 inch bolt, clamp them together and lathe them to size. These parts are for the filter plates. 1 gets welded to the tank and the other one is bolted to it with a gasket. I'll be making the filter part tomorrow.
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