On Thu, 25 Feb 2016 04:42:11 +1100, "Rod Speed"
wrote:

T i m wrote
Rod Speed wrote

but, if you compress something rubber that's
threaded ... what happens to the thread pitch ... ?

Nothing, because the compression is of the
rubber thread into the metal thread, not in the
other direction where it affects the thread pitch.

And how do you think that compression happens?

Like I said, by the compression of the rubber
thread into the metal thread, not in the other
direction where it affects the thread pitch.

How?

snip

Cheers, T i m