Athearn Radio Controlled Crane

Parts for a jig to help cut a square hole the size of the motor.

Bushing used for line up.

Pipe with a piece of styrene the size of the motor
is placed on the swivel base.

Styrene glued to both sides of the swivel base.
This is a template to help accurately cut out the square for the motor.

This method produces a nice clean and square hole.

Motor and swivel base assembled for test fit. Nice fit, looks good.

Added two 1/8" square pieces to get rid of to much side play.

Next I made a brass plate for the motor's D-shaft to fit in.

Next the plate will be screwed to the frame with
00-90 screws.

I'm getting the plate ready to be mounted on the bottom of the crane. That's a #61 drill for a 00-90 tap. The pencil is for size comparison. Four holes were drilled at the four corners.

The part, drill, and 00-90 tap.

The part was used as a template to drill the tap holes. The holes in the plastic frame bottom were then tapped. I know the drill is at an angle. I just stuck it in the hole to take the picture. Hard to hold the camera, push the button and hold the drill with only two arms and hands.