If you can tell in this fuzzy photo, the pin has a head on it. That needs to be placed so that the head is inside the tension assembly. You can put it in from behind but it won't stay.
|tension release pin and tension assembly|
Someone obviously has been mucking around with this set screw. Honestly, I am not responsible for the condition of that screw. Not with my wonderful Brownell hollow ground bits.
|to remove the tension assembly from the face plate, loosen this set screw.|
Once you have released the pin you can remove the knob totally (lefty loosie).
The pin goes into the center of the tension assembly with the head inside of the assembly
To remove the check spring you must loosen this set screw. The center pin comes out and the check spring is freed up. Then you merely replace it with a new one. Be sure that you have some spring and that the base of the spring is positioned at the top of the cut out. Then tighten the set screw to hold the spring in place. ( I guess the check spring has been replaced before, more evidence of screw damage)
This is a lousy photo, sorry. Here you can see (maybe)that this next piece, a washer with "studs" is positioned so that the "studs" point out.
And then the stop washer. I thought the projection on the stop washer should face outward. WRONG. It faces inward.