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Did a bit of work on the central hill with a 4" tool. It's very time consuming when you polish for 5 minutes, then let the mirror cool down for 30 minutes, then test for a bit, then cold press for another 30 minutes, then the rellies come and want to know what I'm doing. At the end of the day the hill is diminishing, ready for a new 12" lap to try and smooth the surface.
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