I installed new V-type brakes on my bike, which is the same type of brakes as it previously had. When I tighten the single bolt that holds the brake arm, the arm does not spring back. If the bolt is loose, like barely finger tight, it will spring back fine, but then starts to unthread itself when I ride around for a few minutes. That's obviously dangerous and not going to work.
This is the brake arm I am referring to:
Another site showed putting grease on it which I did but there was no change. I don't see what else to do and it seems ridiculous that any pressure on this bolt would stop the lever from moving.