2001 Blazer Sun Roof Issue
 

I have a problem with my sunroof where it appears that the sync of the chain with the position of the window is off...it will close most of the way and then just make a loud click after that...I got it closed all of the way by back tracking past the fully open position and then holding the button for a while longer until it was in a position to close the glass...any way I can fix this myself, anyone aware of this problem? I'd imagine its pretty common on a car with 150,000+ miles.

Thank you.