Originally Posted by Kas
I just watched the video. It appears the machine has just been turned on, so the needle bar is doing its side to side adjustment. If your machine was already on and not warming up, this could be the problem. It is the machine and not the foot, maybe.
It was already on, that wasn't the machine adjusting. I don't know what caused it to vibrate like that- I just watched again and that is really weird. I was turning the wheel manually- I don't want to break another needle, so I didn't use the foot pedal.