Look in Your Tool Kit
Larry, in your Tool Kit there is a 13 mm socket, or use your own, remove the cover on the left side of the inner trunk panel(on a '87 300E) and you will see the roof motor. Using the socket you can open or close the roof. There are direction arrows where you place the socket. You should help the roof to close with hand power. Ofcourse lube the track as you close the roof. All of us have had the same problem. M/B has a special wide mouth vise-grip for holding the roof in place and aiding the closing. Possibly some other members can help. Happy Trails Beep Beep from ben there Houston.