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For the Losmandy gearboxes, is there any mechanical way to reduce the 32s (7.5x) periodic error (i.e., not using PEC, or replacing with another Losmandy or McLennan) for example by adjusting the motor pinion mesh?? Or is it just a characteristic of that particular gearbox and it is what it is? It is by no means limiting me in getting good results (typical guiding RMS~0.5" lately), but I do see it in a PE analysis and would address it if there's a 'fix'.? For reference this is a non-tucked G11 with OPW, and the gearbox is new.??

Thanks,
Keith

32s is the time taken for the 1st intermediate gear to rotate 1 revolution (the motor pinion moves this gear).? Thus It won't be effected much by the motor pinion gear .....the jump is more likely between the 1st IE gear and the 2nd IE or O/P gear.

The 1st gear is a dual pinion it has an inner moulded smaller spur gear .....I suspect that is where the jump is between it and the OP gear.

How about swap the Ra/DEC gearboxes to see if that changes. Apart from that its a gearbox thing.
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Brendan