Sorry i maybe being a little dumb here but how can you line up where the existing bulb is if the cover is on with no access to see where the bulb is in relation to where the centre of the whole needs to be cut?
Im just a little concerned that i'll cut in the wrong place, and leave a gaping whole somewhere it shouldnt be! lol! knowing my luck!
Sorry!
Darren
As above it doesn't need to be perfectly in line, just makes life easier when fitting if it's roughly in the same place...