A bukk for a photo speed 'booster'.

[petemoore]

  put a photocell across 2 potlugs, on the Easy Vibe is nice because it's 100k rate knob.
 Doesn't do much more than allow 2x speed if the other speed adjustment is sort of low already.
 That's plenty for about 5 out of 10, considering it is a super quick drillinstall, goes from 'normal' to 'wobble', has less effect when the rate knob puts toward = parallel R with it, a bit more range if the knob is lift switched or phototech provides for lower minimum R.
  The Dark-High R values mostly dwarf the R's of 1 side of 100k rate pot.