Sony DSR-300 Service Manual page 196

6. Rotate the No. 1 gear in the counterclockwise
direction, and remove the coaster (S) assembly
and GL (S) assembly from the rail (mechanism
chassis).
Attachment
7. Attach the coaster (S) assembly to the groove of
the rail (S), and then attach the GL (S) assembly.
4-22
No. 1 gear
(cap)
Rail (S)
When attaching, check that
the shaft is in the rail (S).
Rail (S)
Coaster (S) assembly
Rail
(mechanism chassis)
GL (S) assembly
Attaching shaft
DSR-300/P(E)/V1