Nige: thanks for those ideas

David: Nope, the condenser cover is there. It'd be the bit directly above that. Basically the bit you have to grab to get the drawer out. It keeps getting pushed in too far so we have to take the top off the enlarger to get it out *rolls eyes* ... i mean, i can do that, but we're not too keen on photo society members who've used a darkroom for 5 minutes doing that