Can we get some pics with the button facing up and the bottom of the lever and cap?
Is it the retaining button threads that are gone? It kind of looks like the lever has been bent due to much force applied to it. If any of the parts are stripped and you can't find them or make them is going to be difficult to fix. You may be able to replace these with an older record lever and cap that use a c-clip, or just a full curved QR.