dave wrote:
> I have a glass scale on my W (acme screw). It is stable to about 1 or
> two tenths on the upstroke. I try to overshoot and come back when
> lowering it. 
>   
Well, that's what I do manually on my knee, and it works fine.  I have 
observed
about .001" movement generally in the Y direction when reversing 
direction of
the knee.

Jon

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