Your point 2. The adjuster has an o-ring which keeps from leaking out the e-brake shaft. E-brake shaft seals alone will not stop leaking because there is relatively high pressure generated during braking.
The adjuster that I was referring to does not have an o-ring... Check the pic I posted. I'm referring to the part with the allen head wrench to adjust how close the pads are to the rotor.
Was there a particular section of that video that you wanted to me to look at? I watched it before I posted and my questions were not answered in there.... I also don't understand what exactly you propose I cut and why...
Your point 1. and 3. I (illegally per Saul) cut the adjusting screw off the adjuster, installed new o-ring in adjuster and reassembled.