Gittin 52: The Responsibilities of an Apotropos

Orphans who rely on a caretaker - with implications whether that caretaker is appointed him by the father, by the court, or no formal appointment, as yet. That person is responsible for making sure that their fields are tithed appropriately. Plus, the apotropos needs to swear that he hasn't taken anything he shouldn't have. Plus, the responsibility when it comes to mitzvot. [Who's Who: Rabbi Meir] Plus, a story of how R. Meir protected orphans from malfeasance by an apotropos. Also, how the property of orphans is like that if consecrated property. Plus his responsibility to represent them well, but to what extent does that mean he can use their funds, without it being misappropriation? Plus, is R. Nachman being too lenient or too stringent with regard to the orphans vs. the apotropos?