Don't know if these things are any good or not but we have them were at Eye kettleby at the mo,south field and it's blowing hard. We took the swing down as we knew we'd worry and hate any flapping at night but we still had flutterings and flappings. Checked all the blinds open and closed to see if we maybe had a draft but no difference.Thought it must be the solar panel or aerial wires. Then suddenly realised. The plastic beading awning rail protector. Took it out and hey presto a good night's sleep!