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If what Jean-Philippe says is correct, and it sounds correct, then
holding the clamp (releasing the index arm worm gear from the arc)
should allow smooth adjustment of the little screw as it will take
tension off the screw.  That said, if I were Alex, I might want to
trust the Frieberger technician's adjustment for the moment!

Fred

On Nov 21, 2005, at 2:26 PM, jean-philippe planas wrote:

> Hi Bruce,
>
> My idea is that this screw induces a stop position that monitors
> the gap between the the worm and the teeth. As the position of the
> worm is spring loaded, the worm travels to a postion farther from
> the arc when the screw is driven on and closer when it is backed.
> JPP
>
> Bruce Stark  wrote:
> If you are brave enough to adjust that little mystery screw on the
> back of the SNO-T trommel, be careful not to overdo it. If the
> screw is turned out too far it will be hard to make 0'1 or 0'2
> adjustments to an observation. The wheel will want to turn in
> slight jumps, rather than smoothly.
>
> By the way, I don't think this screw has anything to do with how
> tight the gears fit. What I HOPE it! does is tighten the connection
> between the worm screw and index.
>
> Bruce
>
>
> JPP
>
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