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This is a brand-new rod, and the housing bore measured perfectly round right out of the box. All that's been done to it so far is to unbolt and remove the cap, and then bolt it back up (to de-stress it). The dial indicator has already been zeroed out to the correct bore size, and it is dead on measuring along the axis of the rod beam. But, as you can see, it's 0.0004 tight along the parting line.