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Bob Engelhardt

wrote:
...
I think the washer is the culprit. Although the three points that
touch the washer are three points on a circle, the center of that
circle is not on the axis of rotation. ...

If the center of the circle is not on the axis of rotation, it is
because the jaws are not equal distances from the axis. Otherwise it
will be on the axis, regardless of what's being chucked.

What might not be on the axis is the center of the washer. But the
location of its center is irrelevant.

Bob