Modified: 10/6/2002 with new pictures

Basic wedge made from common materials:
Birch plywood, hardened deck screws, angle iron, lag/hex bolts

Drawing: Side view of wedge

Drawing: Top view of wedge

A modified 'jiffy' focuser.
(See Original )
Lid from a 'Jiffy peanut butter jar.
Gasket from a toilet tank bowl to base (nice and flexible and soft)
A spare 12v gearhead motor from Herbach and Raderman.
Small gear on end of shaft grips into soft tank gasket quite well.
Tie together with some cable ties, and Viola!
(I can get away with it because of the permanant mounting!)