Athearn Radio Controlled Crane

Motors and winch drums mounted on swivel base with four 2-56 screws.

The red line shows how much I'm going to take off the motor mount after discovering and interference problem with the inside roof line.

Job done.

I did some damage when I tried to screw down the shell. Two pictures of front and back of shell.

I removed what looked like an internal gear molded into the plastic on the bottom of the turret ring on the crane. I'm using a piece of single sided copper clad circuit board to make the power ring with two separate tracks. I used a Sharpie marker and covered a portion of the board so I could mark the rings with a compass.

The internal dimension of the turret is approximately 1". I set the compass
to 1/2" and scribed a circle.

I cut out the circle with my fret saw and a metal cutting blade.

Made sure it fit. Trimmed it with a file for a nice snug fit.

Drew some more circles. Outside circle is for
power, next in is for insulation gap, third in is
another power ring, inside circle to be cut out.

First I had to drill a hole to put the saw blade through. A bit blurry, sorry about that. I used a pin vise and manually drilled out the hole.

The inside is cut out for the motor to fit into.

Unfortunately not big enough.