A left hand prop would be useful too!
When I was a newer pilot I was hanging around the local small aerodrome, chatting with a private owner who was working on his C 177 Cardinal. Among the work he was doing was replacing the starter motor. I got it all ready to run, and told me to jump in and start it up for a ground run. I did my checks, and turned the key.
It turned over, but just did not seem right. It would not start. As the prop turned ahead of me, it was just wrong... I thought... I looked at him through the arc of the turning prop, and he looked back at me perplexed. Then he waved me off, as he realized the problem: He'd carelessly installed a left hand starter motor on a right hand turning engine. He started again....