I just installed Bob Drake '34 headlights on a Limeworks headlight bar on my '32 roadster. I drilled a second hole to run stainless cables to the grille shell. The hollow mounting bolt seems to be fastened in the bucket with a plate and four small nuts/bolts. The top of the hollow mounting bolt appears to have a hemispherical end on top that should allow up and down headlight adjustment. However, loosening the four bolts does not seem to allow movement of the hollow bolt. Are these Drake units non-adjustable or am I just not using enough force to move them?