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Rookie question but would like some clarification before proceeding. My plans are Edition 2 Revision 1. I am drafting a form mold on paper before transferring it to wood. On the Wing Nose Rib (75W1-1) drawing, I am assuming the R53 radii measurement is from the tooling hole (190,32) and I have drawn it accordingly. On the plans, however, there is also a spot above and to the right of the tooling hold at x=175mm. Is there a significance to this 175mm mark that I am overlooking? Thanks for your consideration!