slow squash jelqing

You have to compress with one hand at the base. Works best semi erect. Once you've trapped all the blood in your penis, gently squash your penis like an accordian toward your body. Some ppl think that this shortens your penis, but it doesn't.
 
You have to compress with one hand at the base. Works best semi erect. Once you've trapped all the blood in your penis, gently squash your penis like an accordian toward your body. Some ppl think that this shortens your penis, but it doesn't.

how is one supposed to squash it?? using the free hand or in which manner???