Can't help, but I bought one from a garage in Braemar when I drove through deer-infested Deeside regularly for work ... never fitted it 🤦♂️
May still have it in a drawer ... can send it to you free if you want ... you can report on it's deer-scaring properties 🙂
Just like a little red plastic pencil-sharpener looking thing I recall
K
Thank you K but I have a couple left over when I bought a multi-pack for other family member's Christmas stockings! Will certainly report back in due course.