I bet you a dollar they probably just hammered it in place with a socket and ball peen hammer because they were too lazy to walk over and use the press.
And I'll bet you a second dollar that they didn't use anything to measure the depth, but "hummm, this is about right".
Most shops are still banging stuff in there at 24mm or more, and the prop is carving stuff up
I would not try to re-use the cover without first inspecting everything to see what was making that squeal.
Sorry your having these issues.
I would take a HD 25mm wheel spacer, and trim it down to whatever depth you need and carry that in with you and use it as a stop gauge.