BigWallop wrote:
"Dave" wrote in message
...

I've just insulated my Cardale up-and-over garage doors and now need to
increase the spring force to overcome the extra weight. I can't see a
safe way to increase the tension in the central clock-type spring.
What's the secret?

Dave S



An up and over door normally has two tension springs, one on either runner,
that you can wind up tighter with a steel bar or big screw driver. Doesn't
your door have this arrangement?


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No, there's a "clock-type" spring in the centre with cables going off to
the edges of the door.

--
Dave S
(The return email address is a dummy)