On my last Europa rebuild I had completely restored the car and the window mechanism. I replaced all the felt, rebuilt the motors and even polished the scissor mechanism. And as I recall I was able to get the windows to open and close in about 4-5 seconds, still no speed record. But what helped a lot was using lithium grease on the mechanism and black graphite on the felt. You can get the graphite from any hobby store as they use it for those pinewood derby cars. You really don't want to use any kind of liquid on felt, it just makes it stick more. But replacing the felt requires removing the glass and you have to do it while the frame is in the door as the rivets holding the frame to the door are behind the felt. While I had the frame out to paint the car and pre cut and fitted the felt, the rivets requires a special rivet gun with a very narrow and long nose, so I had to buy a cheap gun and grind the sides of the nose down to fit. And even after having the felt pre cut and test fitted, it was a bear getting the felt in while the frame was in the door. But of course that was two decades ago and the memories of all the late nights fussing and swearing had diminished until you stirred it up again lol. And of course I now have another Europa TC project. Sigh. But hey, the things we do for fun. Good luck, Allan