The spring from the pen replaced one of the 6 that holds the contacts in place. There is a large spring around the cam thing that's supposed to spring it back. I could not get it to work properly no matter how I put it in so I gave up on that. It works fine other than that. Just in time for a nice Wisconsin winter. Not having rear defrost would have been bad.
And I made the spring longer to make up for the difference in spring rates, the pen one is noticably thinner but when compressed down it's pretty close by finger-feel. It's not perfect but I needed to get the car back together so my gf could drive it tomorrow and it works for what it's for.