The Ring Release Button/lock tab broke.

The Ring Release Button/lock tab broke.

Can I replace the ring release button? The inner tab (which locks the added converter in place) is broke off. Well, just half of the tab is missing. I still have all but the very tip that engages the flange of the converter thus locking it into place. Can anybody think of something that I can do to remedy my problem? This camera is so underrated.