I have never seen movement like described by John and get the full range of temperatures in the shed as get sometimes over 40*C in there and worse as the cab is under clear roofing panel. No roof insulation apart from some foil paper. I have found that you must not just stop when you have the shape right, but also the right tension in the panel. I will use the shrinker top and bottom until the panel is no longer loose, even with the right shape in it.
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Marcus
aka. Gojeep
Victoria, Australia
http://willyshotrod.com
Invention is a combination of brains and materials.
The more brains you use, the less materials you need.
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