I’m glad I read the comments before going too far. I first tried pushing it back in with a small flat screwdriver bit, then a pentalobe screwdriver. Eventually I got it all in through the hole using the pointy end of a small padlock key. I didn’t have to remove the plastic cover, which I had begun to try, and when having difficulty (couldn’t even get my fingernails to get in underneath the plastic cover), I read the comments.