Ok, late to the party, and I will admit I didn't read every post. This year, I had a spring break on my 7' double wide door. I decided to replace the springs/bearings, and replace the old chain drive opener with a Jack Shaft opener. I ordered the Jask Shaft Opener from Amazon, it is a Chamberlain brand, and seems like the only good option for a non-commercial unit. I have been VERY happy with it. Very quiet, you just hear the humm of the motor, and whatever the noise the door makes on the tracks. It ramps up/down, so there is no "hurky jurky" when it starts to open or when the door stops. It has a separate dead bolt. It is very easy to install, and does not require anything other than one screw to mount the motor.
As far as the spring, it was not too difficult. I followed the directions, on the website I will link below, to a tee, and it was a safe operation. I also ordered the springs from the same website. If you research the springs on the site, you will find, the springs that were originally installed on your door are not the right ones, or have a very short life span. There are all kinds of options listed, for springs which will last longer. I switched from a single spring to a double setup, so there is less stress on the springs, and it is more symettrical stresses on the rest of the garage door hardware.
DDM Garage Doors It's like a ih8mud faq, but for garage doors. You might be able to source the equipment locally, but for all the info, it was well worth it to me to buy from DDM, and I think it was still cheaper than most other options out there.
As far as the spring, it was not too difficult. I followed the directions, on the website I will link below, to a tee, and it was a safe operation. I also ordered the springs from the same website. If you research the springs on the site, you will find, the springs that were originally installed on your door are not the right ones, or have a very short life span. There are all kinds of options listed, for springs which will last longer. I switched from a single spring to a double setup, so there is less stress on the springs, and it is more symettrical stresses on the rest of the garage door hardware.
DDM Garage Doors It's like a ih8mud faq, but for garage doors. You might be able to source the equipment locally, but for all the info, it was well worth it to me to buy from DDM, and I think it was still cheaper than most other options out there.