Gday Shane
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There are some pieces of software, like PHD2 (I believe), that suggest that after reading the PE over a cycle of the gears (24 minutes in this case), they can correct for it, to some extent.
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Its actually better to collect 48 or 72 minutes of data, such that more than one PE cycle can be modelled.
FFT analysis of the data can then ( hopefully ) highlight how "periodic" the errors are, as that will define how well a PPEC model will be in pre emptively removing the errors.
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I believe the idea is that they are an insert into the Declination gearing
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Not an "insert", just replacement gears.
The gears supplied are better quality than the original Meade plastic/brass, but not "that much better" that you would notice in the tracking ( unless your original gears are damaged ).
The big benefit of the tuneup is you get instructions on how to properly set the clearances and meshing in the geartrain.
That said, there are enough "non periodics" in the rest of the Meade geartrain to ensure even the 3 turn PEC model they now use wont work properly.
It can reduce a lot of the major errors, but you still need to guide
Andrew