I read a post where someone installed 16 gauge wire (29" length) into the gap between the glass slide track and the main plastic piece that runs across the entire back (this is not in the window track, but a small gap that can be opened between the window track and the main plastic assembly forward of the window track). With differences in wire types, which result in different girths of the wire, etc. I read posts where some people couldn't open the window, or the motor had to work very hard to open. I decided to try something standard...window screen retainer spline (.120 diameter). The window track is about 29" across, and if you look up behind the plastic assembly you'll see where the window track starts and stops on each side. I used a PLASTIC (not metal) 2" putty knife to pry enough space between the plastic assembly and the window track at the driver's side of the window track assembly with the window closed as there is no glass in the track at that end, making the prying easier. I forced the rubber spline into the gap and then worked my way across using the putty knife as necessary to force it into the gap. As you near the sliding window pane it will become more difficult. At that point open the window all the way, and then you only have a couple inches of difficulty...you'll need a little more force with the putty knife, but it should be no problem. Once you clear the sliding glass you're home free and may even be able to push it into the gap with just your fingers. I ran the spline a little further than the end of the window track (about 1/2") so I can pull it out later if I want to...but it is not noticeable at all. The window slides easily and the rattle is gone.