320ibimmer

I have a problem with the moonroof on my 2000 CLK430. It opens but when you try to close it it moves very slowly and then hangs up. That's when I had to use the roof wrench (with a lot of effort) to fully close it. I've tried lubing the track but it didn't seem to help. Before I open it again, can anyone share any experiences or suggestions because I'm afraid I won't be able to get it completely closed.

Thanks in advance.