Basically the spring loaded thingy is left alone, and adjustments are made using the other two screws only.
Looks like the finder, finder shoe and holes on the OTA don't quite line up for the finder to work as it's not the finder supplied with the OTA originally. I've had the same problem on my GSO dob when changing finders, even though the new finder is GSO also. See if you get some play by loosening the screws that hold the finder shoe to the OTA so you can move it slightly (holes might be slotted even???) in the direction you need, then re-tighten and retry.
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