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Here’s an item not many people seem to know about the starter solenoid:

One the bottom of the solenoid is a metal cap that you can unscrew and remove. Removing the cap exposes a button that, when pushed up into the solenoid, makes the starter crank. It will do this even if the dashboard starter switch is bad or missing and/or if the solenoid is bad and won’t energize. Be careful though, cranking this way bypasses the mercury switch, so it will start even if it is at full throttle. I think it was 1957 when this "feature" was eliminated. The button is handy if you are sitting next to the motor working on it and need to crank the starter without walking up to the driver’s seat.

That is a 6 Volt system. To convert to 12 volts, replace the starter solenoid with a 12 volt one (Sierra 18-5807) and add a resistor in series with the choke solenoid that is same resistance as the choke solenoid,and suitable wattage rating to soak up half the voltage. The 6 volt starter motor will work fine on 12 volts, and will draw some more current, but not double current due to it’s complex inductive nature.
Dave