Leica store Miami sells some parts. I'd talk to them and see if they have one or can order it for you.
Might also be worth while to call Sherry Krauter and DAG. Certainly either one of them could fix it in minutes. Sherry might be near you?
Incidentally, this is the kind of thing Wally at APEX Camera repair in Walnut Creek, CA (long closed) would have fixed in a couple of minutes right at the counter while you chatted with him. He would only charge a few bucks for the part and send you on your way. Good man. I weep at the realization that we don't have many places like this anymore.