Hi all. Here's a photo of the ejector assembly in my new-to-me 1976 39A. Is it installed backwards? The ejector arm retention screw doesn't do anything in any case--it rotates freely, won't back out, and the arm is stuck in it's current position. The assembly won't come out because the receiver screws won't budge, so I need some penetrating oil and a soldering iron to remove it prior to inspection and cleaning. Thanks.