It looks like a complete set of parts. I think the top mechanism is upside down in the picture, if that helps.
If the spring really is too short for the hole in the pitman arm you have, it would seem that putting a plug or some washers in the hole would help the spring apply pressure. The plug might need to have a hole drilled down the center to accommodate the shaft.
At any rate, the mechanism should squish down pretty tightly onto the ball head-end of the knife. I keep a screwdriver handy to push into that little hole on the side of the clamp mechanism, which then provides leverage to open and close the clamp. To fully close the clamp on mine I need to first push it most of the way with the screwdriver, then step on the flat tongue that sticks out toward the knife. You shouldn't be able to open it with your fingers.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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