On Tue, 07 May 2013 10:45:47 -0700, dennisgauge wrote:

Redneck solution involves wrapping the smaller tube
with electrical or duct tape to take up the slack.
Drill for a cross pin to hold the pole at a
predetermined length. Multiple holes in the smaller
tube to make it adjustable.

Thanks for that suggestion.
That's what will try, if no coupling works.

I'll post pictures when I'm done.