Here is a photo of my converted starter. It is from a Mitsubisi V6. The starter is a Nippondenso. I have yet to find a giant scale engine that this starter will not spin with athourity. It is geared and has lots of torque.

Normally, when activated, the output shaft moves forward to push a gear into contact with the flywheel and then a contact is made to spin the motor. You have to remove the spring which retracts the output shaft. Also remove the output gear. Obtain a Miller drive cone and center drill it to fit the shaft. I believe I used a 1/2" bit. Drill the side of the drive cone to accept a set screw. Pull the shaft forward and drop about 5 washers over it. While the shaft is still forward, install the drive cone. The washers space the drive cone out and allow the pushing force to press against the output bearing.

I bought a heavy duty switch from Auto Zone and cut one end off of a set of jumper cables to use as the power cord. I also installed a finger guard. The shape of the starter is very comfortable to hold with out auxilliary handles.

Ken