Take a hardwood dowel, same diameter as your plug. Drill grommet hole in it, just a hair bigger than the grommet (so you can get it back out easily). Take a scrap piece of wood and cut a half circle in it that is the same diameter as your plug. Insert the grommet into the dowel, place the half circle over the grommet and smack with a hammer. Your grommet now is bent with the same shape as your plug.
Jigman
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