I had tried using a somewhat loose-fitting rubber grommet on a test
> piece of aluminum but the addition of the grommet did not reduce the
> noise by any significant amount.  I was reluctant to modify the
> equipment itself until I knew if it would help.


You said that this was a piece of desk gear. So why not mount a leaf switch
on the side, in it's own
small box, and be done with it? No noise and simple to fix in future if the
announcer manages to break
off the switch arm.

R
--=20
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