Originally Posted by Wallo
Do you have any pictures as to how it is attached to the inside of the jack? I would love to change mine to this type to use with a battery
Below is a photo which I just took showing the jack head with the cover removed.
You can see the ring gear in the base of the gearbox with the pinion gear to the right. On the shoulder of the pinion gear (just to the right of the teeth) is a role-pin. (the little brown thing at the bottom).
You knock out the role-pin, which allows the crankshaft to be extracted. Then you can insert the new shaft, align and drive in the role-pin, add a dab of grease,and reinstall the cover.
Be sure to drill the hole in the new shaft the same size as the original and at the same distance from the tip.