I had my heq5 pro upgraded a few years ago and its performance is much better than it used to be, as for the idler axis i had a friend make me a new one so i could revert back to its original state if i have to (no i won't). A few pointers for adjusting your mount, make sure you remove as much as possible the backlash of your axes especially at the dec. Also remove the cone error of your setup (i used conesharp) as it helps with its performance. FYI with my RC 8 i can get under 1'' of error at phd so the mount worths the upgrade

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