Langsrtaat, I designed a device to stop moles when an old friend in Wales was plagued with them. Take a plastic bottle and carefully cut three or even four if possible letter box type flaps. Cut them with the long cut lengthways and the two short cuts one near the bottom and the other near to the top. fold the flaps out so it makes a sort of inside out turbine type thing. Push a garden cane into the ground close to the moles tunnel. Cut the head off a two inch nail and fix it into the end of the cane with the point uppermost. Now place the plastic bottle over the cane upside down. Exert a little pressure so the nail makes an indent in the centre of the bottom of the bottle. Now as the breeze blows the bottle will spin and rattle against the cane which will annoy the moles. All being well, they will leave. The letter box flaps should only be on the straight part of the bottle. I/e start at the bottom and end before the neck.
If you have trouble with the instructions let me know. I will make one, photograph it and post the picture so you see it.
Trevor.