Super manual it contains all the things you need to service your Marantz 2100.
Text excerpt from page 25 (click to view)
HCD-FC7 SECTION 4 ASSEMBLY
� This set can be assembled in the order shown below.
4-1. HOW TO INSTALL THE CAM (EJECT LOCK)
1 Rotate the cam (BU U/D) fully in the direction of arrow. 2 Engage the gear (eject lock) and the gear of the cam (eject lock) aligning the mark with the center of the gear (eject lock).
cam (BU U/D)
mark
gear (eject lock)
cam (eject lock)
� bottom view � front �
4-2. HOW TO INSTALL THE CAM (GEAR)
1 Check that the cam (BU U/D) can not be rotated in the direction of arrow. 2 Align the mark on the cam (gear) with the boss as shown in the figure and install the cam (gear).