Great service manual. Unfortunately on page no. 41 there are some details which i can't read.
Text excerpt from page 16 (click to view)
Mechanism Assembly (Type B)
Note: The pickup mechanism assembly has two types, A and B of which shapes differ. For the SD-4700/5700, only Type A is a service part. Type B can be changed to Type A pickup free from any performance problem. Type A also has two types, but either of the part can be used for service.