WHENEVER THE DOOR CHAINS ARE REPLACED OR ADJUSTEED, PROPERLY ALIGN THE DOOR CHAIN GUIDE THEN ENSURE THE SCREWS IN THE GUIDE ARE TIGHT AND HAVE HAD LOCTITE 242 APPLIED IF THE GUIDE IS ADJUSTED FOR ANY REASON ENSURE THE SCREWS ARE TIGHT AND HAVE HAD LOCTITE 242 APPLIED.
note: if the screws come out they can interfere with the operation of the door.
