Difficult one to tell without seeing what you've done. Does the spool spin freely, is the handle turning ok, when you press the spool release does it pop back up when you turn handle. If so could be pinion gear not engaging, possibly you clipped it in wrong groove on the carrier . There's another video on my channel with a complete strip and rebuild for these. When you remove the handle side unit you should see the pinion move when pressing release button and project noticeable from plate when turn handle.
