Hi Robert:

If you view the trigger, you will see a small vertical spring and atop of that spring is a lever that powers the spring. The end of that lever that pivots down into the back of the trigger is what gives the tension to the hand. That lever will be on top of the hand lever that fits in the rebound slide. Before you place the hand in the trigger, lift the back end of that lever, that rests on top of the small spring and lift it up. I would suggest placing the trigger, steel on steel, in a vice so you can left that lever up with a small screwdriver or pin punch and while you have that lever up, place the hand in the trigger. The hand will have a short and long peg on the inside of the hand. The lever sits between those to pegs. That is what powers the hand. Hope that helps you out. It took me awhile but then a light bulb went on and reasoned it out. Let me know if you have success.

Nick

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NRA Instructor\GCA Gunsmith