This is a Quick video on how to convert the cheap 24BYJ48 geared stepper motors from Unipolar to Bipolar.
This is done to give them more torque and make them easyer to drive with standard drivers.
24BYJ48 Steppers on eBay (affiliate)
https://goo.gl/TDYjsP
Part 1 of the Bluetooth Controlled ActionCam Slider
• P2: Bluetooth Action Cam Slider | Part 1