I figured something had to be missing. It didn't make sense to need tools to raise or lower a light mounted on top of a hardtop.Mine has a plastic wing nut. Lost one a few years back but found that they use them on toilet bowl lids.
I've tried to adjust it to do the same thing, but it won't. I wonder if it once had a spring that is no more.I have the same light and I just use a broom handle to reach the light and just push it upright. I never tighten or loosen it and it always stay in place.
it may be just to tight - you can use a big flat head screwdriver in the fitting to loosen it a bit.I've tried to adjust it to do the same thing, but it won't. I wonder if it once had a spring that is no more.