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The box is from Radio Shack and is 7 3/4 x 6 3/4 and 3 1/2 inches deep. The light dimmer is attached to the drill, then the box.

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Close-ups of the drill and wiring, as well as the bracket which holds the rear of the drill.

Bracket holding the front of the drill.

The threaded rods are equipped with ny-lock nuts to act as a bobbin stopper, the curved side positioned toward the bobbin to help center it. Wing nuts are used to hold the bobbin on. Where the rod was a little smaller than the bobbin hole, duct tape was used at each end.

Bobbin rods were built to fit my bobbins (all thread rod cut to desired length).
a. (top) Large rod 1/4 inch x 20 inches
b. (middle) Medium rod 3/16 inch x 24 inches
c. (bottom) Smallest rod l/8 inch welding rod with slight bend to keep bobbin from slipping, instead of lock and wing nuts.

The motor control is a standard light dimmer. A rubber grommet is used to restrain the power cord at the box.