I have a Blomberg oven, installed 19 years ago. The silver label under the door says TYP 1750 LX-KM W-1. The plastic knob which turns the oven on and sets the temp has broken at the shaft so that I can’t turn it on. There are internet sites supplying Blomberg spares, but nothing for my product number. I expect it’s too old. Can anyone help? I have to cook a large turkey in a few weeks time! Thanks.