I have the heavy duty window regulator in my passenger door, and I just confirmed today that it is responsible for putting a dent in the door skin. I started this thread before suspecting that the dents were only caused by the OEM window regulators since I have seen several DeLoreans with the same dents in the doors. Anyway, I HEREBY OFFICIALLY COMPLAIN THAT THE HEAVY DUTY REPLACEMENT WINDOW REGULATORS SOLD BY THE DELOREAN VENDORS HAVE A DESIGN DEFECT ALLOWING THE TUBE TO PUSH AGAINST AND DENT THE DOOR FROM THE INSIDE. I'm not too much into yoga, but I was able to operate the window electrics from the center console while holding my hand on the outer door skin. As I rolled the window up & down, I could feel the door skin warp considerably as the window regulator tube pushed on it. In fact, there is a tube-shaped dent in the center of the door where this is happening. It shows up really well when the light hits it right such as at evening car shows. For those of you with dent-free doors, I highly recommend being very gentle when rolling the windows up regardless of whether or not you have the upgraded window regulators are the old OEMs. Take your finger off the switch immediately when the window is at full travel because any further may dent your door from the inside. I'm planning on trying the dry ice technique of dent removal. If that doesn't work well enough, then I'm just going to cover it with the optional dealer side stripes. Another idea that I'm going to try is to glue a swatch of fiberglass PC board or heavy gauge stainless inside the door to protect the area. If I were one of the vendors of the heavy duty window regulator, then I would definitely start selling them with such a reinforcement panel or come up with a different design. Who is the one who 'invented' the standard heavy duty window regulator? Is this another Zilla product? Enough people on the DML have noticed the same dents in their cars, so something should be done about this before it gets anyone else's doors. Walt Tampa, FL