Step 1: Bill of Materials
Two brass wire brushes of your choosing
A small wood saw
A drill whose size of bit shall become clear in the following steps
Some kind of strong glue of your choosing
Step 2: The Mechanism
I eventually settled on a mechanical penguin. It was perfect!
I carefully disassembled the tin beast and removed it's innards leaving them completely intact.
Step 3: The Brushes
Step 4: Fitting the Motor
I simple held the motor in place for the first hole and let that be the anchor for the others drilling each in turn after the first. There was a slight but inconsequential variance in the placement of the holes that was easily corrected.
With the holes drilled I simply mixed some two part epoxy. You could use about anything, I'm just not fond of waiting for glue to dry and prefer to use something faster.
Fill the holes with glue and slip fit the brushes to the motor. Simply hold it in place until the glue sets.
Step 5: Turn It Loose!
(....check out the video at the beginning.)