Re: Starting handles
Good point about only pulling, I'd forgotten that one, but now you mention it I remember being taught this rule.
As others have said make sure your thumb isn't around the other side of the handle of you want to keep them. Like with steering wheels on old cars, clip a curb or some such and the spokes of the steering wheel can smash your thumbs in short order.
Likewise I've never had to do it to a plane. The only time I was in a plane which needed hand turning the pilot very insistently said DON'T TOUCH ANYTHING while the guy was near the prop.
Starter motors make life so dull what with missing out on all this excitement.
The other nice feature of having a starting handle is that when you're working on the engine it provides a very convenient way to turn the engine.