Hypothetically speaking, though, the nail polish is clear. If you let it dry before you screw it in, it might take up enough slack to hold. AND, you can always use acetone to remove the polish if it doesn't work. The screw on my mom's 15-91 light won't hold. I'm going to try it there when I finally get the cabinet re-done.
A bonus is that the nail polish is not white like plumbers' tape. Of course, if the nail polish doesn't work, then white plumbers tape is better than a floppy light. Thanks for that one, too.
bkay