Shopping Cart removable Key

UPDATE!! Tested both designs and the carts can unlock easily but only V2 can be actually removed from the cart (the ones I managed to test). V1 is to wide and it cannot be turned enough in order to be removed.

! Please print V2 !

My two years old son is playing with my keys and when he drops them, the shopping cart key keeps breaking; I changed the model a little, made it stronger; I will print it with 4 perimeters