I am trying to find some type of mechanism where I can have a smooth but not too stiff rotation between two metal pieces. I was thinking of putting a shoulder screw through the pieces (the pieces will be side by side) and a nut at the end.
A real world example I can think of is how when you're unfolding a ladder, the part that unfolds has a joint where rotation occurs. It's smooth and stiff enough that you can let go midway and the ladder wouldn't collapse inward, but not too stiff that you have to apply so much force to unfold the ladder. What do they use to do that?