Continuing to dig into different areas and now on to hinges. After fighting with the first hinge for an hour pounding out the pin I discovered this metal sleeve inside the door part of the hinge. See the photos for better visual explanation. The first pic is the body part of the hinge and has no sleeves in it. It makes the pin super tight to try and reinsert (and equally difficult to remove). Looking at as many threads/pics/etc that I can I'm assuming this isn't stock and was maybe added in at some point? Haven't tried removing it as of yet. Goal on this is to allow more easy removal of pins going forward when doors come off in the summer. Those with some hinge rebuild experience, thoughts?