I had the headlight adjusters break on my 87 GL about 6 years ago.  If I
recall correctly, I went to Ace hardware and purchased a long skinny bolt
(may have been a fine-thread screw) several nuts and several sizes of
washers and sandwiched it all together, using the locking-nut method.  It
worked like a charm.  All it takes is time and patience to get it right.
Adjusters were available back then, but I didn't want to hold up a planned
road trip waiting for them to arrive.  I suppose necessity IS the mother of
invention.

Warren in Santa Fe
88 Westy