How to make a balancing part like Matt Dusek's Balance?

Odd question. How would I make a part that functions in the one like Balance where players moving to a side of a part make it tilt in that direction slowly (like a seesaw, sort of)?
Example: Balance with Matt Dusek - YouTube

One of the simplest questions. You need a hinge constraint.

I tried this a while back, it shook way too fast iirc