On Thu, 25 Feb 2016 08:47:03 +1100, "Rod Speed"
wrote:

snip

I know what it looks like,

But don't understand how it works and where the rubber is compressed by
what.

I know how it *could* work, if it was going to, I was just asking you
to explain how you thought it did. So far your explanations haven't
said anything specific.

I'm asking you to answer the question.

And I did.

By asking another question.

Cheers, T i m