Don't try it at home on anything else.
In the early 70s we used to do them in Hueys too - hold the aim point in the chin bubble, go past the "normal" flare height, and when you get to the bit where your bumcheeks take a bite out of the seat cushion, pull sharply on the lever. Then cushion on, wait for the heart rate to stabilise, and do it again.
One suggestion was to fit a broomstick through a hole through the floor under the lever, which flared for you as it touched the ground. Never tried that one, though.