This is a continuation, and a change, of my thread below... I wasn't sure of how to change the title, so I started a new one here. So it seems the bobbin isn't the problem. It was suggested below that the needle was hitting the bobbin case, so I took it apart and that doesn't seem to be the case.
Now the flywheel is spinning (with or without the bobbin case and bobbin in place) and the machine is not working properly. Sometimes it will work and sometimes the fly wheel will just spin and the needle won't function. Sometimes when it does work, the motion is very jerky and erratic, sometimes it works smooth. Like I said in my other post, the machine was working fine the first couple days we had it, then it decided to go postal on us...
I have posted a video on YouTube,
I'm sure it does a better explanation than I. I am mechanically illiterate, so any guesses as to what's going on would be great. I'd like to tweak with it and see if I can avoid the long drive to the repair shop. Thanks in advance.