Eject problem on superdrive

I took my Macbook Pro apart after my son spilled Sprite on it and it is back together again, but I'm having an issue with my superdrive. The drive takes a DVD in and plays it, but it won't eject it. It seems like it doesn't have the strength to eject it completely out through the felt in the top case. After unsuccessfully trying to eject the DVD, the superdrive will launch the movie again. I also noticed that it seems like I have to put the DVD in almost all the way before it grabs. Reinstalling the superdrive is pretty straightforward, so I can't imagine what is wrong. If I take the bottom lid off and take out the superdrive while still having it connected, I can eject the DVD.
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Any ideas?

Thanks