Well oddly enough i was thinking of MAN’s when i wrote that ■■■■■■■■, cos in my experience MAN’s blows so few bulbs in the front headlight cluster that when you do eventually get a blown one, those TX45 (IIRC or might be a TX40) screw bolts can seize on the captive nuts, ask me how i know this 
, making the whole job a PITA cos you need to force a spanner onto that captive nut in order to remove the screw which is not ideal working by torchlight at 4am 
, so MAN’s are a definate contender for greasing the bolts up…having said that the design is basically sound for bulb replacement out on the road…unlike new CF’s where they must assume you have the arms and fingers of Mr bloody Tickle, and what the hell Scania were thinking with the headlight bulb fitments on new-gen i’m buggered if i know.