Automatic chain-driven openers ought to have a slack along the chain for optimum operation. With continuous use though, this slack is bound to widen. Alternatively, the gear and sprocket assemblage may wear out, making the chain trip off the sprockets. It’s possible to replace the chain on your automatic garage door opener with an easy fine-tuning mechanism. What will you need? A stepladder A flat head Screwdriver A 7/16 inch wrench Disconnect the Garage Door from the Opener To achieve this, simply pull down on the emergency release handle to free the trolley from the door opener carriage. Press the…