This is a recurring theme and for years "Mr MOT MAN" cannot cope with the 40/45 watts head lamp bulbs fitted to our cars. If you fit more powerfull bulbs without a relay then you will melt the column switch . My car has been running on LHD headlamps for 10 years in the UK . All I do is blank off the right dipping section of the lense with a little insulation tape, get the MOT then pull it off for the next 364 days. As for swopping the lenses , when I have done this I have soaked the light unit in petrol for a day or so untill the sealant tuns to jelly [-/