I have had this one for a year and it works perfectly (apparently not all of them do).
www.amazon.co.uk/gp/product/B076KZF645/ ... UTF8&psc=1
At £7.99 for 2 with free Prime delivery it's the bargain of the century. I've also got a disklock for when I park on the road or carparks. It's heavy and a pain to put on and off but very difficult for thieves to remove.