There is a slider underneath that you slide along into tight position which holds it in place if I remember rightly on audi handles, there are also some plastic lugs that hold it with the slider, check both as if lugs broken then thats not a simple fix, but to be honest best fix for that & dont laugh is loctite mate, brilliant tool, but check slider, also evostick which is durable with movement is another good one, you might think thats a bit *****, but then you compare the audi cost to replace & paint/fix then the receipt for the glue, urm which shall I do, you wouldnt even notice it thats for sure.