Hi, I new to this forum. Have a 52 f1. Once you remove the window from the door, the glass itself is attach to a steel U shaped mount. Removing this is tricky so if you don't need to replace the glass, leave it be. If you do, use a rubber hammer gently, no screwdrivers or the glass will break. Also there is webbing in between the glass and the steel mount which will have to be replaced to seat the glass to avoid chipping and excess vibration. Hope that helps.