Hi guys. I have three bathroom down lights in the bathroom ceiling. Overtime the whole unit does not adhere to the ceiling anymore, as i have to pull down the whole unit every time i have to change the halogen lamp, leaving a 20mm gap between the rim of the unit and the ceiling as the hole in the ceiling has become slightly bigger overtime.Do you know any tricks to make them adhere to the ceiling please? I was thinking of wrapping some masking tape round the unit, however the whole unit becomes very hot and i wouldn't like the masking tape to catch fire. Thank you for your inputs.