Found a pic of the "head" part taken off my embossed FR from a while back.
[ATTACH=CONFIG]345299[/ATTACH]
The 2 large screws are what held it onto the machine. The green #3 points to the backside of the tensioner, but it is also very close to the "knob" part that connects to an "arm" on the machine side. It moves, but that's all you have to connect if you don't take any other parts off the "head" part. I have taken off more parts on the "head," like the presser spring, tensioner, so on, but it may not be necessary if they haven't been gunked to death. Like I said, pretty handy way to get to everything. (The #1 and #2 were showing how the tensioner and tension dial connected.)