My seven inch headlight pointed dead horizontal - i.e. too high to hit the road on dipped or main beam.
I noticed that the two side screws (placed at twenty past eight, as it where) were holding the bottom of the inner chrome rim slightly away from the casquette. I made the screw holes in the inner rim a bit more oval and it now sits square. This dropped the beam slightly.
I have also inserted a stepped spacer made from thin scrap plastic between the two chromed rims so that the top of the outer one is pushed out a couple of mm from the inner one (the top screw clamp still holds properly).
This has pushed the beam down a little more.
The problem is that the gains were slight and it still seems high, though I need to have another good run in the dark to assess it properly.
An outer rim that was much deeper than standard at the top and a bit deeper at the bottom would align the beam properly and give more rear clearance for the bulb's connector block. If only somebody would stamp some out and sell 'em cheap.