If the Clerk's certificate shows that the petition is insufficient in valid signatures, the Clerk shall at once notify each member of the petitioners, hereinbefore provided for, of the amount of such deficiency; and the petition may be amended by securing additional signatures, at any time within fifteen (15) days from the date of the Clerk's certificate of examination. Upon the filing of such an amendment the Clerk shall, within ten (10) days thereafter, examine the amended petition and attach thereto a certificate of the result. If still insufficient in signatures, or if no amendment shall have been filed, the Clerk shall file the petition in the office and shall notify each member of the committee of that fact. The final finding of the insufficiency of a petition shall not prejudice the filing of a new petition for the same purpose.