11.1 Many torsion spring replacement accidents occur from springs that are too strong. If the garage door stays on the floor by itself, remove the vise grip from the track. If the door is off the floor and the roller is against the vise grip, close the door with one hand and remove the vise grip with the other. If the springs are too strong, you have to restrain it from flying into the open position.
If a roll-up door, assuming you have not put in cabinets or anything that prohibits sliding the shaft sideways about 2-3 feet out of the spring to change it, then about $200-250 should do it for a 2-car garage door. If he has to disassemble the brackets to remove the springs because the shaft cannot slide sideways enough to get the springs on/off, then probably another $50-100.
After you’ve ordered your new garage door, we’ll perform a site inspection to confirm your door size. We’ll contact you to schedule the installation, and our professional installers will do the rest. They’ll deliver your door, take down the old door, reconnect your opener if there is one, seal your perimeter and provide a final walk-through where they’ll clean up the area and haul away your old door. Additional fees for haul away may apply in some markets. We are happy to provide answers to questions you may have at the time of your garage door and opener installation. https://www.youtube.com/watch?feature=youtube.be&v=Z_eZc-kh40c
9.9 Go to the other side of the garage door and insert the end of the cable into the drum. Rotate the drum until the cable is tight. Slide the drum against the bearing and push the shaft to the right. The marks should line up. If they don't, figure out why and correct the problem. It could be a stuck cable, the garage floor may have shifted, or the vertical angle that helps support the bearing plate may have loosened and shifted. Many garage doors have been installed with a gap between a drum and a bearing plate. The cable drums should always be flush against the race of the bearings.