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Not sure how you are trying to put this together.

The mount with the locking collar is on top of the console.
Underneath is the spacer and then the lower mount or flagpole mount which is inverted.
The screws go through the upper mount and the lower mount.

Why isn't your fitting correctly?

Maybe the attached photo will help.
In the center you will see the spacer. This goes underneath the console and then the base or flagpole which is inverted.
This is the way it came off the boat in proper order and you can see how it all fits together.