I used tape to hold the brass "nuts" in place to allow the screws to be located. Not a good design, but then they are Lucas!
I eventually replaced my nearside unit due to the bulb getting stuck due to rust. I sealed the under wing area with silicone and resprayed Dinitrol to prevent further water ingress. I will try to find an internet source I came across that sells individual components....screws,nuts,seals,bulb holders etc..the original light had filled to halfway with rainwater, a common problem by all accounts. I drilled small drain holes to let it out until the replacement arrived.
On my previous car...1993 4/4, the rear light failed. It was a poor earth found using the "wiggle test".
I stripped the light, cleaned it and made a new earth, dabbed petroleum jelly over it as a cure.
It is worth checking for corrosion,bad earths etc in older light units. Lucas, poor seals etc arenot a good long term combination!
