Geoff,

This will probably be very labor intensive....

If it were me, I would probably:
1. Remove the gripper motor.
2. Unbolt the gripper mechanism
3. Make a cheat sheet for the cam switches assembly.
4. Disconnect all the cam switches.
5. Unbolt the cam switch mounting plate.
6. Remove the Gripper Reversing plate actuator rod.
7. Remove the tone arm assembly from its base.

If I haven't missed anything, at this point you should be able take the gripper, shaft and cam assembly out as one unit. With it on the bench, you can at least get down to business.

If you send me your email address off list to "sales(at)jordanamusement.com",
I can send you the parts diagram exploded view of a 448 mech in .pdf format. However, I will be out of the office from 7-4 until 7-10...