I'm thinking that we can cut the middle out of the black disc and let a bit in, but I need to know what's behind it. If it looks like we can fit something in from behind, we can make a part that replaces the broken bit and carries the bolt. I'll need a bit of help from you tho, you'll have to cut the middle out of the panel and post it to me. I'll design and make the replacment part for you for free, if you'll try it and feed back to the forum if it works and what you had to do to fit it. If it all works out, I'll post the design, and instructions of how to get it made on the Forum for download by anyone who needs it.