the hob simmerstats (regulator) all four of them have a lot of play on the shaft (up n down left n right) and when viewed from the front they all hang about 5mm lower than the oven knobs? the lady says this is how they were when she got the appliance, has anyone else come acroos this?? ive got to replace one of them and shes bound to say why dosent it wobble like the others..