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The original black belts can shed material and it can build up in the gear teeth. Did you clean all that build up off?
The cam lock pin is a touchy part of the PMX. That pin is very hard to get tight enough to actually lock the cam in my experience but it does not seem to be critical. The cam pin should be locked down but tends to pop up.
The screw above it - not sure what it does. It may lock the 2 vertical threaded rods/bolts above the cam pin. They determine the tightness of the worm and gear and too much and the motor will stall. Too little and the axis will slip on the gears too easily.
From memory those 2 top threaded rods are opened 2.25 to 2.5 turns from fully in.
The little grub screw's purpose is best asked of Software Bisque. Chances are its not connected with your tracking issue. I doubt it. Its probably locking something like those 2 vertical threaded rods I mentioned.
Tensioning the belt, making sure you got all the build up off the gears from the belts (I used a small allen key and got it in the teeth of the motor gear to get it all off) or poorly tensioned cam lock are likely causes.
The threaded bolts can also mess with tracking.
If too loose you can also get backlash and an oscillation back and forth in your tracking until things are at correct tension.
So, make sure the belt gears are clean with no tiny black rubber particles around, make sure the cam is tensioned well and if you are getting slipping of the RA axis under load then tighten those 2 vertical bolts until just right (firm but not stalling the motor and no slack when moving the RA axis with your hand).
Chris Venter has a couple of videos of replacing the belts and tensioning the cam.
Greg.
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