This video shows the internal prism plate of the Celestron 25X100 Skymaster binoculars in order to understand collimation. Actual collimation is NOT shown in this video, only an exploration of the parts that ALLOW for collimation.
Note: You'll notice that the right hand prism housing's vinyl covering has been removed. Most bins have collimation adjustment screws under that covering but these didn't so I scarred my bins up for nothing. :-/