Back Ache

If you spend enough time at SF campus, these chairs are so common you kind of forget that they're a staple.
People forget how unbearably uncomfortable they are.

Each stool is either ridiculous tall or too short for working.
And they could really benefit from a small amount of back support.

But what's really fun about these stools are the bottoms.

 The bottom knotches SHOULD be adjustable.. but no one really knows how to adjust them.
We've attempted screws but we can't find anything that properly fits the holes.

I've used these stools for at least two years and all I know is that the legs become wonky and start to shake all over the place.
However, with a simple mechanical height adjustment system (a.k.a some sort of stopper installed into the feet)
and a backing these stools might be more comfortable than most office chairs.
And probably healthier.