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What may be happening here Peter is the too balanced and not loaded to the east if there is a bit of looseness in the gears causes the autoguider to correct one way then correct back the other way. Like the guider is correcting the corrections.
That would make sense why constricting the guiding down with min/max works. Only some of the corrections are getting through with a max move of .2. So if the mount wanted to do a 1.0 correction its only letting a .2 correction or perhaps none at all (not sure if it lets up .2 through or rejects anything over .2 completely). So the oscillations then are more muted.
A loose popped up cam pin I think can increase gear looseness.
Greg.
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