Craftsman Garage Door Opener
HELP: My garage door opener is a Craftsman Â½ hp unit, model 139.53673SRT3, SN 41286C00309, date on label is 10/98. The garage door sometimes only opens a few inches and stops. I need an ownerÂs manual to adjust the unit correctly. Please let me know where I can obtain an ownerÂs manual. If this is not available, can you send me via e-mail adjustment instructions. There are two blue turn screws on the unit. Thank you for any advice you can give me.