As the mistake was accomplished by the god Indra, he grants Hanuman a want that his system could be as sturdy as Indra's Vajra, and that his Vajra might also not hurt him. In conjunction with Indra other gods have also granted him wishes: the God Agni granted Hanuman a https://medium.com/@HinduTempleAdelaide/exploring-the-divine-presence-of-hanuman-ji-mandir-in-australia-910f7436fb0f