Mini Camera Gimbal

Alright, well don't get your hopes up. Without dampers, better bearings, stiffer chassis and the ability to make fine adjustments a selfie stick still works better. However this does demonstrate the general principle.

It is designed to use 624ZZ bearings like these: https://www.amazon.com/gp/product/B071CFN91S
M4 nuts/bolts like these: https://www.amazon.com/gp/product/B017N7ZI72
Springs like these: https://www.homedepot.com/p/Everbilt-Spring-Assortment-Kit-84-Pack-13554/203133714

1/3/18 - See update below

However you can get the general idea using the printed bearing and pin with a few rubber bands.