Sorry to burst anyone's bubble but .... it doesn't work! I have a mole that has so far evaded everything - tunnel traps (digs alongside to by-pass them), flooding, mothballs (throws them out). So I tried the bottle windmills (2 of them) and placed them in the mole runs (scraped away the hills and opened up the hole and stuck the bamboo cane in the centre).
It has been breezy here for days and is so this morning and the wretched mole has filled in all the holes I created where I scraped away the molehills and has even filled in the hole around the bamboo cane that the windmill is on!! This windmill make quite a noise as well, because the base of the bottle has groves radiating in the base and it sounds a bit like a football rattle as it rubs against the wire - still spins freely.
I have news for you folks - moles don't mind noise and vibration one bit!!
I am getting an 'Inspector Dreyfus twitch' (Pink Panther - Peter Sellars) from this mole!! I have never experienced one so difficult to erradicate. Usually, I manage to spot them working and get them out with a spade but this one always seems to know when I'm there!