Been using a Tak 7x50 finder converted with a helical focuser riding on top centre line in adjustable rings for years. I use a regular finder for alignment of the mount (or use the guide cam as an electronic finder) then remove the offset regular finder to remove asymmetric yaw and imbalance.
Use a Lodestar, so absolutely zero issues finding a guide star ever. Been using the guidescope with Lodestar much more frequently lately as a finder, not even bothering to mount the regular finder.
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