Rock-ola 451 gripper failure

Failing to grip disc off the deck to replace in carousel.
The gripper is kicking up before the arm retracts inwards so is above the
disc rather than peripheral to disc before lifting.
The m/c has not been used for some years and and suspect the grease in the
paired cog area has gone sticky.
Holding the gripper arm down with a bit of finger pressure allows gripper to
work.
Also using service switch to step the drive the gripper arm repeatedly lifts
and then drifts back when there is no drive motor until the point of the
full lift drive engages.
If it is a grease problem , how to take this paired cog section apart to
clean ?

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Diverse Devices, Southampton, England
electronic hints and repair briefs
http://home.graffiti.net/diverse:graffiti.net/