This is what I used to fix mine and it was nib and I never had any problems again with it.
Unplug machine and make sure power is OFF then make sure the coil is not jammed up and moves freely up and down, then bend the metal tab that is straight just enough to catch the coil.
The video explains it.
Good luck!

No not my video; just a video I found when I was trying to fix my door problem. That video was the most helpful in explaining the problem and the solution. Not sure about the copper, email Ken at JJP he was very helpful with any issues I had with my dialed in.