Tacker,

A cheap fix would be to find a piece of pipe that is a little larger ID
than the vertical pin as a sleeve. Drill a hole in the proper place to put
the sleeve. Cut the sleeve so it is a little short ( doesn't stick up above
the threshold ). Fill the old hole behind the sleeve and around the top of
the sleeve with wood putty. Sand the putty flush with the threshold, Paint
the putty gray or silver.

Dave M.