I am looking for information related to converting my electric windows on my 1987 Mercedes Benz 300TD Wagon from electric to manual with a hand crank.

I am sure this has been covered in a previous thread but if not can anyone tell if/how one can convert from electric windows to manual? Your help would be greatly appreciated. I have had this vehicle for shot 6 months and I have really enjoyed owning it. The sunroof still works at nearly 30 years old!

Thank you in advance for your consideration of my issue. I am hoping to apply this knowledge to an older classic car I have been working on.

Best