Here's a neat way to obtain adjustable tension on a pivot or a slide in a simple mechanism -- install a washer 'sandwich' made of two flat washers and a split lock washer, like so.
A self-locking nut, e.g. a ny-lock nut or a prevailing- torque nut, is essential to the assembly. Pictured is an output chute from a snow thrower. With its original complement of fasteners and washers, the chute couldn't be tensioned and tightened properly -- it wouldn't stay set at a desired angle. I've fitted the chute with washer sandwiches, and now it should operate as it's supposed to. Thankfully, a working trial on a snow-covered driveway is a ways off.
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