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On the "wind side" you can loosen the four screws holding the two
cross pieces in place (the cross pieces hold the rotating disk in the
frame) and move cross pieces slightly to center the scales and tighten
up the disk. There are also two plastic pieces in the frame that bear
against the disk to put friction on it to keep it from rotating
inadvertently, makes sure they are in place. If you heat them you can
bend them to place more pressure on the disk.

gl

On Aug 1, 6:09�am, Renee Mattie  wrote:
> I saw an old Weems and Plath Dalton E6B at Bacon's and snapped it up.
> Imagine my surprise to see that they are still making these things,
> and offering them for sale athttp://www.mypilotstore.com/MyPilotStore/secp/22.
> I could have gotten one new ($12.95) for less than I paid at Bacon's
> ($15.00), and the last page of the manual wouldn't have been a jigsaw
> puzzle of yellowed and crumbling paper. �Ah, well, the heavy leather
> case is still in fairly good shape.
>
> Here's the thing that surprised me about my new old E-6B. �The moving
> parts are off-center.
> On the slide-rule side, the grommet seems to be off-center. �So if I
> set the dial for 60 miles/hour, I'll apparantly go almost 18.1 miles
> in 18 minutes, though almost exactly 9 miles in 9 minutes. �So the
> slide rule is good to probably about half a percent, which is not
> quite as good as my cheap plastic high-school slide rule (which went
> missing 20 years ago).
>
> On the vector plotting side, there is a little slop in the inner ring,
> but the center point seems to generally be a quarter degree West of
> the center line at 200mph, or a full degree West at 60.
>
> Have I got a good one or a bad one?
>
> Thanks
>
> Renee
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