Super manual it contains all the things you need to service your Marantz 2100.
Text excerpt from page 8 (click to view)
KD-S641
2.2 CD Mechanism Assembly 2.2.1 Removing the top cover (See Figs.1 and 2) (1) Remove the two screws A on the both side of the body. (2) Lift the front side of the top cover and move the top cover backward to release the two joints a.