>>6068631Get an exacto knife, preferably with the blade looking like pic related.
Cut the part off the runner with a little more plastic on the nubs, lay the part flat on a table (preferably with a mat or something) then, with a downward motion, slice off the nub.
Alternatively, you can sand it off using multiple grits of sandpaper. Start off with a coarse grit then sand with finer grits of sandpaper. If you're afraid of dust you cat lightly wet it.
Optionally, you can use a nail buff to polish the part afterwards.
