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I have only used a facetron and the way I deal with the 100ths is to take the 10ths number imagine lines using .05 as the center base line. After finding the middle of each number a good reference point can be achieved to find .025 and .075. Like what was stated earlier, getting that close is all about the meet from there. But I can return to a previous facet to finish polish with out any issues or any fault of accuracy in the return to a facet for REWORK–hate rework