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Hi Kent,
An old timer from my machine shop told me years ago that he could make a pair of eccentric bushings that when rotated just so could place the smallest diameter (a hole) precisely to some target location within the eccentric (he called it throw) scope of both eccentrics. This way, craftsmen in the field could manipulate the bushing pair to a precise target by rotation of both bushings, each in a certain way.
The way he explained it, you rotate the large and the small bushing together a certain number of degrees, then rotate only the small bushing a certain number of degrees.
.... or the small bushing first, then the large and small bushings together -- next.
I can't remember the sequence it's been so many years.
I'm fixing to try it like the old days -- plot the drawing to several pieces of paper, cut out each bushing and find me a board and a thumb tack -- and do some rotating this and rotating that.
Len