Nope. I understand that.
What I mean is a way to relate the slider to the iron top. Right side is so close to the iron that I zero to the iron and move the base that fraction of an inch to the slider.
When moving the long arm from the iron top to the left side of the slider the zero can be lost if the iron is not perfectly planar. The length of the arm magnifies any variation in the iron top.
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John Hinman
Boise ID
K700S and A941
