I don't think you commented on my suggestion to use optical interruptors.  It 
would seem these combine simplicity and robustness.  
David


Quoting ivp <joecolquitt@clear.net.nz>:

> > I would place a lot of faith in an Allen Bradley type J potentiometer.
> > I bet you get 10000 operating hours from one of them.
> 
> TBH I'm still inclined towards contacts or resistance / voltage, simply
> because to me they're a known quantity and I think will help to get
> this project finished ASAP. Other methods are just fine and I'll sample
> some 16F193x to investigate the mTouch for future reference, perhaps
> even swapping it for whatever goes into the project to get it going
> 
> wbr
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