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Spring loaded reversing switch is Key.

Friction Drive ( Works)

MotoFocus

Make cardboard, then soft aluminum sheet prototypes with:

1) 1543:1 Tamiya 3v DC motor gearbox (C30813-43 Edmond Scientific)

2) Spring loaded DPDT switch
(like: Reversing Starter Car Switch, with cross jumpers)

     
to motor
 
     
|
 
  +
—>
A C E
 
DPDT switch
   
x
(jumpers from A-F & B-E)
  -
—>
B D F
 
     
|
 
     
to motor
 
Double Pole Double Throw

3) Tension spring (.25 O.D. x 3" ~2 lb./in.)
4) 1/8" I.D. Rubber hose & O-rings (for friction drive)
5) Battery holder (2 AA)
6) 50' speaker wire (24 ga.)
Total Cost: < $25 & 12
hrs.

Quite convenient when scope is 40 ft. away.

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