def METHOD_NAME(self):
    """
    Method to re-insert original multi-index headers
    """
    loop_val = 2
    for p_col_name in self.header_list_p:
        p_col = list(self.in_df[p_col_name].iloc[self.header_col_cnt :])
        self.new_df.insert(loc=loop_val, column=p_col_name, value=p_col)
        loop_val += 3
    self.new_df.columns = pd.MultiIndex.from_tuples(
        self.multi_index_headers_list, names=self.idx_names
    )