On 4/28/13 11:48 AM, Don Phillipson wrote:
I need to lengthen a solar blanket roller, to reuse it on a
larger swimming pool. The roller is two aluminum tubes, about
4" diameter, end to end, linked by a third tube inside, ridged so
that it touches the enclosing tubes at about 8 points. How to
extend this telescopic tube sysem? Hammering on the inner tube
(reached by a crowbar) earns me half an inch a time, but I am
apprehensive about building up a burr on the aluminum, that
would jam the tube permanently.

Is there any useful trick to unstick telescopic tubing?


Could you seal the ends of the tubes? If so, maybe a little bit of
air pressure in the tube plus percussive maintenance.
A reminder though. It's pounds per square inch and 3.14 X the radius
squared at the ends of the plugged tubes.