hi. i have just moved into a property with a homeking hof600ss built in electric oven,and the fitting to hold the inner door glass at the bottom is missing. is this a part i can buy or is there a certain way of fixing it in? i just cant work out how its held in place. the top of the glass slots in but there is nothing to hold the glass in place. as soon as the door is closed the glass drops down. would appreciate any help on this. many thanx