If a Ger candidate had a Mila, and before T'vela, decided against going through with the Geirus. If he ever changes his mind again and become a Ger, he wouldn't need Hatafas Dam Bris. Even though a circumcised Goy needs to have Hatafas Dam Bris in order to become a Ger (and here too he's coming to the second conversion already circumcised.) There, he wasn't circumcised in order to become a Ger. Therefore his circumcision is meaningless as far as Mila is concerned and needs a Hatafas Dam Bris. But here, where the original Mila was done to become a Jew, so the change of mind doesn't ruin the original Mila and they could precede by doing the T'vela.
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The same would be true by a Ger Koton (a child that had Mila and T'vela done to him to be a Ger.) If he protests being a Jew when he becomes Bar Mitzvah (which he can, since he never accepted to keep the Mitzvos)if he wants to become a Jew later in life he doesn't need the Mila and T'vela again . Since his original Mila and T'vela was done to become a Jew, they still count, and all he needs is to accept the Mitzvos and he's a full fledge Jew
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