Suppose you had an aluminium garden rake handle and you wanted to make
an infinitely-adjustable angled joint half way along. Where can such a
joint be obtained cheaply, (preferably made of rust-proof metal -
ideally aluminium)? The joint should have a built-in screw or bolt for
tightening it at the set angle. Has anyone seen such an item for sale
lately?

Even if it is part of some tool or other equipment, it would be of
interest, if the tool can be bought fairly cheaply. (I can cut the
joint out and use it for my application). Those garden parasols come
to mind...

The joint has to be quite strong. Plastic would probably not be strong
or rigid enough.

Thanking you, hopefully...

Al D