6 X5 a! ^, h$ q; I. \: C; b3 z3 O应该有一个帮手在旁边,主要是在你用力的时候,及时给你拿拿工具。并注意帮忙人避开弹簧扳手回转的平面范围内。2 j3 I1 A N: d a
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严格按操作过程,特别是在紧弹簧时,门用卡钳锁紧的步骤,一定要可靠,不然弹簧力量一旦大于门的重量,门会突然上升,会冲到你上弹簧的钢筋,危险。
My husband was first wanting to try by himself; since it is very dangerous, we googled and found Robert garage door Edmonton and that guy did very good. Recommend to you.