locking mechanism of a double sliding glass door

I have a double glass sliding door (both sides can slide). The handles have JW imbossed it them (see pic).   One of the levers to lock the door (from the inside - there is no key from the outside) is broken off.  I could not re-attach this lever back as shown in the 2nd pic.  I can put back the lever manually and lock/unlock the door.  However the lever will fall off again since there is nothing to hold it to the locking mechanism.  Pls adivse me on what to do to fix this.  If I have to buy a new replacement part, pls provide link and info on how to order.  Thank you.