Installing some new headlight bulbs I noticed that the nearside headlight unit wobbles horizontally a few mil left and right. It's enough to notice when driving in the dark. It is not the headlight unit itself which is bolted in quite securely, but the reflectors. They adjust up and down with the mechanical adjuster and the electric motor quite happily, but I can't find anything that adjusts horizontally. Clearly they can as something has come lose inside allowing the wobble. The offside is quite steady.
Has anyone found they have a wobbly reflector and if so, other than jamming something in it to keep it steady, any ideas on how to fix?