Hi. I am trying to change the headlight bulb on my '85 R4 TL. There is a black plastic "bin" on the inside of the headlight assembly, with a rubber bung on the side with the wires passing through it into the light. The black plastic bin will slide round, but I can't see a way of getting into the back of the light to change the bulb. I don't want to use brute force on the plastic bin, for fear of breaking something. I expect that there is a technique to getting the bin off and that one of you kind gentlemen might be able to explain into me. Or maybe you get the bung out and re bulb through that small orifice ? Thanks Edwin