Oh really. I need to use the camera. Thanks!

It's the radio

While speedrunning Portal, I've always tried the trick where I get the radio from the room near the beginning and put it next to the door at a slanted angle. I would soon figure out that there was a glitch where you could skip that entire section and go to the last part of the chamber. I've tried the trick and failed many times. One time I did it but I haven't been able to replicate it. Since then, I've always had to the trick with the radio. Does anyone know any easier trick?