On May 10, 10:38*pm, Don Foreman
wrote:
On Sun, 10 May 2009 22:01:24 -0500, cavelamb
wrote:

You know those magic telescoping poles that can lock?

Useful for boat poles, spinnaker and jib poles, or changing light bulbs.

Anybody have a clue how these things work?

They're slightly elliptical, *so they sort of cam lock when the mating
parts are rotated relative to each other.



My pool pole, for net, brush, or vacuum, has two telescoping sections
that are locked together wirth a plastic collet type clamp. Each part
is about 8' long.

Wolfgang