[Rich72C10]

Thank you, I more or less get the theory behind it.

The nuts the long screws (adjusters) go on my 72 C10 are metal. When I had the light out last, I was checking the upper one on the passenger side and it was loose in the frame (slight 360-ish movement). Though I did not really see how it would pop out - last thing I want to do is do something silly tying to get it out and bend anything to make it even more sloppy for the new replacement (which is a nylon replacement).

For the headlight screw that sits on the headlight can, it also has back and forth play with the screw's slot.

Then on installing the new nylon replacement, I have read other threads where members can't get it popped in or its tabs break when trying to pop it in. Just looking for any words of wisdom :-)