I would shy away from having someone steady the base of the mast when stepping. Too many things can go wrong and the person steady the base of the mast can get hurt pretty bad. Get the new mast base if yours is broken. This is fairly important part.
Nick
Current Boat Looking for one
Previous Boats '84 H16 '82 H18 Magnum '74 Pearson 30 St. Louis, MO