I went to install the new yoke on the tractor and it would start and then bind. So I examined the threads and they looked good. Then I noticed the threads are coarse; the threads on the draft control plunger on the tractor are fine. The person stated that the yoke was for an 8N. I will have to return the yoke; and it is in better shape than when I received it, cleaned up and painted. Were two different plungers/yoke used on 8N or did this part come from a different Ford? Or, did someone replace the draft plunger rod on my tractor with one not from an 8N? Do I need to replace the plunger; part #541? Or do I have the correct plunger and not the correct yoke? This project just isn't going well.