Regulators do warp. Often it is because of lack of lubrication or the aluminum guide bar already being bent. I think the regulators are supposed to be flat, but it's been a while since I've seen one because I got so tired of the power windows not working that I installed manual window regulators from a European W116.

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DON'T MESS WITH MY MERCEDES!


1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles