In an earlier contribution to this discussion,
Dave wrote:

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?


The FAQs on the Cardale site at http://www.cardale.com/ might help.
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Cheers,
Set Square
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