In a message dated 19/06/00 10:50:02 GMT Daylight Time, danieo@............ 
writes:
> Amateur constructors need not be daunted at the prospect of
>  having to buy expensive penmotors. 

    Shops which sell Radio Control Models also sell proportional control 
servos at a reasonable price. They have a feedback potentiometer built into 
the motor unit. You can get various swing arm fittings for them.

    Chris
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