Originally Posted by Bill Burk
Just take the lens off the camera and push the pin in. You'll see soon enough if the lens is the issue.
p.s. I had the Spotmatic F w/50mm f/1.4 around my neck while reading this so all I had to do was take off the lens and try it myself...
Like I said in the first post, taking the lens out and pushing the pin it works with little resistance. It seems that the camera spring doesn't supply enough force to push the pin.