Rockola 442 gripper assembly timing

I am working through a number of issues on this 442. The seller had replaced the fuses with solid chunks of copper, so somewhere down the road I figure I'll probably find some critical component nuked beyond recognition, since the power supply is still working. I know there are problems with the 25VAC in the pushbutton switch assembly, but for now that's unplugged while I try to get the mechanism working.
I am starting with the mech and I've hit a wall. Here's what I know is working: the pinbank, when operated manually does get things started; both the gripper and the magazine motors work (but not necessarily at the right time); no components in the control box are visibly fried, and the (3) microswitches test OK using the tone function of a digital tester. I have read here that an analog tester is better suited, but I do not have one. Removing each switch, referring to the manual, they all appear to conduct properly to the NO and NC sides. But at this point I've blown a lot of time and a lot of fuses trying to get the microswitch cam adjusted properly so that the #1 switch roller is in the drop-off slot with the gripper arm over the basket.
The problem is that the #3 switch never gets near that slot, so it's always engaged. #3 is where I'm looking for problems, because the mech will not cancel, either via the tone arm switch or with the cancel button on the back (I have yet to observe the mech reverse for any reason). Finally, I decided to observe the cam operation on my 460 to compare and discovered that not only does the 442's #3 never cam out, but that the Gripper Shaft Assembly (#14 on Page 32 of the Parts Catalog) is not timed properly. The cam that engages the tone arm is off by about 90 degreees. This means that the tonearm does not synch with the gripper bow and jams. The motor is disengaged from the gear now to test the gripper movement. Question: how does that Gripper Shaft Assembly position adjust?

Patrick