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Old Wednesday 12th December 2018, 12:27   #2
andyadcock
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Join Date: Dec 2005
Location: UK and Occasionally St Petersburg, Russia
Posts: 16,818
All you need is a basic frame with a dense, netting tacked to it, this will absorb any impact before a bird hits the glass.

Make sure there is some give in the netting, don't stretch it too tight and make sure that the gauge is not of such a size that birds can get stuck in it.
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