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All door springs are connected to brackets that are located at the bottom of the door and they are under extreme tension. Our specialists warn owners against tampering with brackets as it is very dangerous. Now most manufacturers sell tamper proof brackets that only professional technicians can operate.
The first step involves disengaging the opener while the door is fully closed. Then you need to put on a pair of protective gloves, lift the unit half way up, and let go. If there is proper spring balance, the door should not move. If it goes up or down, timely adjustment will be required.