If the temp. wings don't need to move, at least during the show, I've used a short piece of 1-1/4" pipe and a flange screwed to the
stage. You'll need to pad the pipe out with some wraps of gaf tape or similar, since there's ~3/16" of
play with 1-1/4" pipe (and of course 1-1/2" is juuuust too big)
.