Why won't the handle stop turning on my kohler tub faucet?

I replaced the stem and barrel seat. The new barrel seat has an o-ring and the old one did not. Now when I try to turn off the cold water, the knob keeps spinning and there is a slight drip regardless of how far I turn it. How do I fix it to stop turning and also shut the water off completely?|||You might have got the wrong size and type stem.|||turned out I had a bit backwards when putting it in, working great now for many months!

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