You don't have to reinvent the wheel here - Teddy has a suggestion for ya ...........
Teddy had a couple of suggestions about your cat problem, but seeing as this IS a family forum, I told him to put his gun away, and go for a more humane solution :lecturef_smilie:
Seeing as your already using a cover, why not just place a couple simple little 'Mouse Traps' no bait even needed, on the seat under the cover. No one will be able to see them, along with the cat :shocked: til he sets one off :yikes: & it scares the :cus: out of him :mad: It won't be strong enough to really do any harm to a cat, and you may have to reset them a time or two, but I betcha, once bitten, kitty will be twice shy :2thumbs: