1. There isn't enough space between the arc of the prop and the leading edge of the wing on a PA28 to safely swing from behind in my view.
2. Remember that at the bottom of the arc on a TW aircraft the prop is closer to your legs/private bits than it is to your head at the top if you swing from the front and vice versa... hence swing from the rear.
3. My Auster, like many others, is fitted with a Lycoming and an electrical starter.
4. Enjoy the wise words of Dick Gower, Chipmunk owner and CFI with more than 12,000 hours of instruction here
http://www.ycem.com.au/images/CFS/armstrongstarter.pdf
kaz