I have a 1999 K2500 4x4 and the headlight adjusters turn but do nothing. All four do the same (nothing). Is there a way to get them to operate without breaking them? I have taken the entire headlight bucket out and the adjuster turns but nothing happens. I didn't want to dismantle them any further for fear of breaking something. The lights are aimed very high and it is difficult to see without the brights on. Any suggestions?