Doors with extension springs have two sets of pulleys (which are sometimes called _sheaves_): one at the end of each spring and one at the top of the vertical door track. They also have two cables on each side. One cable attaches to the bottom of the door, runs up and over the pulley above the door and around the spring pulley and then attaches to the door track bracket. The other cables are safety cables that run through the middle of the springs and are fixed to a track bracket at both ends. These cables restrain the springs if they break under tension. All extension springs must have safety cables.

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Warning! If the door is partially open and crooked, don’t touch it. Period. It’s a sign your door is off balance, and it’s usually caused by a problematic cable. It’s likely the door is still under tension from the spring, and one false move could send a 150-pound door crashing down, causing damage or injury, says Vincent Johnson, owner of Garage Door Doctor of Cypress, Texas.
1. Garage door springs do almost all of the work of lifting your door regardless of the door being manually or automatically operated. The spring makes it possible for anyone to lift a product that might weigh one hundred pounds on the low end and many hundreds of pounds on the high end. Not only can anyone lift it – most can do it with one hand! In other words, the garage door spring does a lot of work. 

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Rolling sectional overhead garage door spring replacement should cost somewhere between $195 to $300 for a quality set springs (50000 cycle rating). This price will very if the garage door repair company charges a service call fee (trip charge). The most important thing to consider along with price is the quality of the springs and the warranty. There are any company that we use lower or mid quality springs and charge on the higher end because they include a lifetime warranty on the springs. The catch is that this warranty will only covers the spring for life and labor only for 30 days to a year. Look for a company that offers a equal parts and labor warranty. This insures that the warranty represents the rating of the springs that are being installed. For instants, you may buy a 1500 cycle rated spring set (last 3 years +or-) for $200 with a lifetime warranty and 1 year on labor. When a spring brakes after 3 year the spring its self is covered but the labor cost to replace the warranty spring can be between $65 to $100. This can add up over the year as the warranty will not restart at the time of the warranty replacement. On the offer hand, if you purchase a set of springs rated at 50000 cycles (last 10 year +or-) for $270 with a 10 year parts and labor warranty and a spring brakes in 8 years it would be replace at $0 cost. A must batter value! Always check service company review and get the details on the quality of springs a garage door repair company uses and the warranty, part and "labor".
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I was disappointed with the pressure of a tub and shower that were plumbed with 1/2 supply lines (2nd floor). Could be low pressure from the street, but I want to replace with 5/8. Plus, I'd like to have 2 back to back showers, one inside and one outside. So, I had intended to bring a 1 supply to both, then branch up to valves and shower head with 5/8. Finally, I thought pressure from the street was typically 55 to 70 psi and I am concerned if pvc can take that.Any thoughts?
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