F/FA lenses have different design from A lenses. If the lens has not been dropped or disassembled before, it is highly unlikely the 'A' contact was broken or distorted. I guess it could be the oil.

Yours regards,
Alan Chan
http://www.pbase.com/wlachan

I played around with the contact to no avail.  I did try a very tight
rubber band around the aperture ring.  That works!  Seems like maybe
inside there is a spring or something that pushes out just enough to
break contact?

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