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Is gaffer's tape also known as Duct tape.You find in all sorts of places.
a small blob of clear silicon either end also does the trick - in fact I never bother screwing down any of the green houses we have they are all just sat on 3 or 4 canisters of silicon
I don't think you would get away with that on South Uist!!
I can't wait to see the plants in their new home. You will have so much fun in there. Like I said before I live in a windy situation and its great to escape the wind. I have a koi pond in a polytunnel and when it's blowing a gale I am cosy in there the same with my greenhouse.Angela