How to detect a small pin

"Buerste" fired this volley in news:huidq9$bak$
You need a copy of "Ingenious Mechanisms for Designers and Inventors"; the four-volume set.
There is a wealth of feeder/orientation/presence/absense sensing information there (including pin feeding mechanisms).
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Lloyd E. Sponenburgh
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GOT IT! Great inspirational set. My favorite is "Geneva" mechanisms, built something to index knot bush disks using ideas from the book.
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