You don't need a plane. Glue the plugs in with the grain running in the same direction as the grain in the mast. After it dries, take a sharp chisel and carefully pare the top of the plug down so that it is even with the mast surface. Sand lightly if necessary (it may not be) and you're done. It's usually better to make plugs (or bungs) out of the same kind of wood as object that you're putting the plugs into so that the whole structure will expand and contract at the same rate.
Jim Fulton
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