“I don't think that your explanation will be enough for the Mashgiach to pater you from a knas.” (Weiser)

“Since the trial would last over Shabbos, the judge patered him from jury duty.” (Weiser)

“I'll join you later if I can pater up some time.” (Weiser)

"I think using what Halevi is saying, that there is a time when she’aile cannot be used, you can answer the second question – sometimes b’poel it is takah not shayich to pater yourself, but it is still a shvachkeit in the lav that it was made with a self-destruct mechanism." (source)