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720 revisited
Wade:
You might handle the second optical switch without having to separate the transmitter and receiver? (Separating them might make it real hard to get it to work again) You could mount a small tab sticking down from the main wheel. Something like this:
| | < center axis of main wheel
---------------------------- < main wheel
| | | < tab, and center axis
The tab could slide right through an optical mounted under the main wheel. Since the switch would actually trigger in the opposite manner, this might not work, but if 720 isn't picky about whether or not the second axis "walks" or "twitches", it might work. Just a thought.
Wade