Hi I have a Henderson Merlin garage door and I have replaced the wire to both
sides. I’ve re-tensioned both sides and the spring. The garage door seems to
be working backwards so when the door is opened it gets harder as it is opened
up. This should be the opposite and should open with ease and by itself? Do you
have any idea what has gone wrong? I’ve tried to re-tension the spring both
ways and it doesn’t seem to make a difference?
Pretty obviously, you've done it wrong. ;-)
It shouldn't be *that* hard to work out that the spring should
tighten as the door lowers consequently you'll need some
pre-tension in the fully open position and the tension should
increase as the door is lowered.
As John says though, take care as these springs can store a lot of
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