The rotating piece was likely placed in a mold and the rest injection molded around it. I can see possible ways to get it out but they would be a lot of hassle.
If i was to do it I would use a beverage can made of aluminum. cut the top and bottom off puncture with a knife and cut with scissors, cut the remaining cylinder to make a flat sheet.
Cut two pieces to fit the narrow width of the opening, cut slots in them to clear the pin that it rotates on. Slide them in bend them over the sides. Cut a full length of the aluminum to the width of your masking tape and use it as a tool to pull tape thru front to back.
Sand and clean it up. Spray from as far away as possible so the paint is thin, multiple coats.
On the crack figure a way to clamp it to close the crack, super glue and clamp it, If there is room to clear the part it goes into reinforce the crack area with epoxy.