If the ferrule has truly moved on the shaft the cure is not to just fill the gap.
 
For ferrule creep the cure is to gently warm the ferrule and move it away from the hosel, clean and prep the shaft under the proper hosel position, apply epoxy and move the ferrule back to the proper position.
If it's a gap from careless assembly you can fill the gap by taking some ferrule "lace" (the stuff left from ferrule turning) and place it in a small glass or metal container and add acetone, stir until it becomes a paste and fill the gap with the paste. When dry turn the ferrule and wipe with acetone for final polish.

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