Looks like an adjustable pressure point with a contact point made of non-compressible and non-marring contact pin.
Cheap!
____________________________________ There are those who would misteach us that to stick in a rut is consistency - and a virtue, and that to climb out of the rut is inconsistency - and a vice. - Mark Twain |
Chinese Proverb: When someone shares something of value with you and you benefit from it, you have a moral obligation to share it with others.
