The argument from vagueness for modal parts

It has been argued by some that the argument from vagueness is one of the strongest arguments in favor of the theory of temporal parts. I will neither support nor dispute this claim here. Rather, I will present a version of the argument from vagueness, which - if successful - commits one to the existence of modal parts. I argue that a commitment to the soundness of the argument from vagueness for temporal parts compels one to commit to the soundness of the argument from vagueness for modal parts. I say compels, but not entails; an objection to one of the arguments highlights analogous ways to reject the other, making it difficult (but not impossible) to endorse one and reject the other. This would be a significant conclusion, if true, since there are far fewer (if any) who currently commit themselves to modal parts than the many who currently commit themselves to temporal parts (and who do so in part because of the argument from vagueness).