Is the sensing tip extended from the rest of the assemb or is it flush? Also, can the mount spacing be adjusted?
I once worked on a similar system that counted spacing on an assembly line track, the exposed tip became damaged from debris. We re-ground the tip to the proper shape then adjusted the mount so the spacing to the track was correct. Not sure it will work for your situation, but I thought I'd throw it out there.
-Nick
::edit:: Sounds like this wont work. Your post came through as I was typing
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