I've started my OS FX 1.60 with a backflip even when it was cold. Get a good prime going, put heat to the glow, and snap the spinner or prop clockwise with a flick of your wrist.

This method is much easier if you have the prop installed so that the top prop blade is at the 1:30-2:00 O'clock position when it hits the compression. This is also a good position even if you don't finger start your engine because if you deadstick your prop will usually be in the horizontal position, the chance of breaking a prop on a bad landing is greatly reduced.

If you have a Higley prop nut instead of a spinner: With your middle 2 fingers on the top inside of the top prop blade and your thumb on the bottom inside of the bottom prop blade -- flick your wrist clockwise, at the same time bring your fingers back away from the prop to keep from being bit.

If you have a spinner you do basically the same thing but its more like spinning a top.

The idea is not to try to get the engine to go through the compression stroke, just to bounce against it; when it bounces it is going in the proper direction when the engine fires.