The spring powered garage door lifter for slab doors is almost always of the kind illustrated in the video.

How does a garage door work.
The garage door works with many components all working together to form one system.
There are two types of systems and both depend on garage door springs to provide the assisting force.
Precision garage door has expert knowledge about garage doors and can give you a peek into the inner workings of this valuable invention.
Your garage door is operated by a counterbalance system which uses a force to offset a weight in this case the garage door.
Just how the linkage works is a mystery to most people and its not easy to study a real.
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