I wondered whether anyone has any suggestions with regard to the noise the thing generates as it is opening/closing the door? I'm sure there is no problem with gearing etc. But I suspect the garage door is being used as a sound board and amplifying the minor vibrations that must take place as the door moves.
Not outrageously noisy, but if I opened the door at 2am I'd probably wince a little in case I was waking a neighbour up.... ;)
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