(following up to my own message)

Based on the responses I've received it seems that my hinge is different
from everybody else's. The ends of the tube are welded shut (and possibly
the pin is welded to the end or ends--I can't tell). There are no grease
fittings. So while I could probably jack the tower up such that the hinge
is correctly aligned, I can't simply drive out the old pin and put in a new
one. I think the end welds have to be ground off and then maybe repaired
after the new pin is in place. Hopefully a welder/machinist will be able
(and willing under the circumstances) to do this. It might be nice to have
a couple of lugs welded near the top of the pole as well. Then I could run
a safety chain around the tower to prevent it from falling off the pole if
something like this happens again. In fact, it might be a good idea to do
this first, making the subsequent work safer.

Dan Lanciani
ddl@danlan.*com