How did it get up there, did you cut the fork down? In any case you can push it down with any sort of punch. But before you do so, see of your cap screw is short enough to allow the cap to be tightened against the end of the fork.
This is the acid test, since in use the cap will need to be tightened until it's not quite touching the fork (1-4mm gap). If you can bottom out the cap, that's farther than you'll ever need to so you're good to go.
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