Yes I know this must sound like an idiot asking a math question and for all intended purposes it's an ignorant person asking. Not ever getting anything higher then a "F" in math they just passed me on through grades happily being rid of me. Anyway, back to the question. If half of 3/8" is 3/16" would not half of 9/64" be 9/128". Now, being there's no 128ths on a dang ruler (at least none I have, nor could I see it if there were) how do you measure it. Oh! And lets not reply with decimals cause that's going far over my head and won't do me any good. I reckon your next question for me is, "how in tarnation do you run a lathe and make pipes not knowing decimals and such and the answer is I have a fractional caliper.
What I reckon I'm asking is there another fraction used for 9/128" if there is such a thing? :scratch: