Did the locking mechanism slip when you had it back together? The cogs that mesh together whwn pressed together (to put the circlip on) are very much a pain in the arse, and need to be held down all the time whilst you put the plastic spacer, bearing and circlip on the other end. I push it onto the corner of my toolbox with one had and do the circlip with the other.
Do you get the ratchety sound when using it? I'm afraid to say try again! Just make sure the cogs stay meshed, you can peek and look before putting the motor belt pulley back on. But until that circlip is on, a mm of movement will ruin your day!