Hi Brian & Denise,
I have a 1998 750 tag axle and have had the windows separated several times. If you take the internal screws out they do attach to the actual window, but it will not drop out due to the sealant. You can push it out if you want to re-seal it.
You can tighten the spring loading by hand on the blind before fitting. In ref’ to your problem, when you depress the catch it releases the pressure at each end. I removed the existing ends which wear away and stuck on the rubber at the end of a pencil. It worked a treat for me.
Hope this makes sense.