I talked to someone at APQS in Carroll yesterday about getting this tension knob out. They had told me to take out the screw "around the corner and to the right", and I did, but couldn't get it out. I was afraid to mess with it too much, I didn't want to break anything, so I left it until I could call them.
I have to take out the old spring and put in this new one. I don't have time to do it this morning, but will give it a try when I get home later.