One of the other mount has a tiny split where the strap secures but is is only there to guide the strap into the ratchet and does not impair the use at all. I have keys for the clamps as well but I have never bothered locking them so cannot guarantee they work.
Otherwise feel free to contact me with any queries. The item "Thule towbar mounted 4 bike carrier" is in sale since Saturday, March 04, 2017. This item is in the category "Sporting Goods\Cycling\Car Racks". The seller is "morro1234567" and is located in south heath, Buckinghamshire. This item can't be shipped, the buyer must pick up the item.