72 c10 door lock question

[Speedracer39]

I have a 72 c10 and the drivers door has never locked with a key since I’ve owned it. I can lock it from the inside and it will unlock perfect from the outside with a key. I removed the door panel to take a better look. I can reach in and move the horseshoe looking piece by hand and it locks and unlocks perfectly with no binding. I removed the lock cylinder from the door and the prawl moves like it should with the key but with the key removed I can move the prawl by hand I’m thinking it shouldn’t and this is my problem. Any help would be appreciated.