Blown89Stang

I just got this car a few weeks ago and never checked the seatbelts. I tested the driver side with a couple quick tugs and it doesn't lock. So I went to my local mustang used parts warehouse and grabbed a used assembly. Seemed to work just fine. After installation , I decide to clean the strap. In doing so I pulled all the slack out of the reel and now it won't retract back. I'm wanting to go to the track today right after work so I'm pressed on time, any suggestions? The reel is almost locked into place like I need to release something. Thanks in advance!!