I don't have any way of seeing your picture, but one good place for
Elmo parts is Denevi, 1-800-447-4469. They have parts for the classroom
projectors although not for the xenon theatre machines.
There's some outfit in the midwest that has made replacement delrin
gears for the ST series and some of the other Elmos, which will last
longer than the NOS ones, if that's your problem.
FrameWorks mailing list