Yes...roller bearing. My opinion is the slotting fix MIGHT help if you feel the white "fingers" and/or the regulator don't have a lot of in/out movement. (By in/out, I mean in toward the center of the car or outward).
The slot fix may be worthwhile to reduce rotation of the window in the track. HOWEVER, the roller bearing addressed both issues. The bearing guides in multiple ways. Hopefully, I can explain this.....
Set correctly, a bearing provide another "finger". This is a product of the length of the "shaft/screw" it's mounted on. If close enough to the window rail, the edge/side of the bearing acts like another "finger". This stops additional regulator "sag". The face (rolling edge) of the bearing limits movement 90-deg from this. That pressure keeps the window from tilting/rotating in the track.
Stated in cartesian coordinates....the side of the bearing keeps the window from sagging out of the x/y plane. The rolling "face" of the bearing keeps the window from rotating clockwise/counter-clockwise within the x/y plane. Movement out of the x/y plane is a result of poor (plastic) regulator parts. Rotational movement within the tracks is due to the inferior brackets that attach to the bottom of the window. The later may be exacerbated by the accuracy of the mounts....which is why a few have found improvement slotting the mounting holes. If you DON'T have issues with the plastic parts, slotting might help.
2001 Ebony VX and 1989 Custom 383 Corvette
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