Mine in my 2011, 3670 has come off 3-4 times. Pop off the cap, loosen allen screw, then get some lock-tite. Not sure which color. You don't want the one that is permanent. I tightened mine several times and it kept coming loose. After the lock-tite was applied haven't had a problem since. Go to an auto parts store and ask them. Don't do Wally World and ask some uneducated person to help you---you'll end up with a permanent handle, which may not be bad unless you have other problems. Hope this helps. Steve