Want safety? Try this-
First, position the crank to where the handle is at the 12 o'clock position when facing the tractor....
Then, while standing on the left side, (the clutch side), smartly pull the crank towards you.
This way, if it kicks back it will simply pull the crank out of your hand and your body motion from pulling the crank will remove your arm from danger. I would experiment several times with the switch off first! Hey, it works for me and I could screw up a brick!