Such recall petition may be amended at any time within twenty (20) days after the making of the certificate of insufficiency by the Clerk, by filing a supplementary petition upon additional petition papers, issued, signed and filed, as provided herein for the original petition. The Clerk shall, within ten (10) days after such amendment is filed, make like examination of the amended petition, and if the certificate shall show the same to be still insufficient in valid signatures, the Clerk shall return it to the person designated in such petition to receive it, without prejudice, however, to the filing of a new petition for the same purpose, provided that no new petition shall be filed within three (3) months thereafter.