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Kollel Iyun Hadaf, Jerusalem
(a) If there were no Kohanim available, to remove Tum'ah from the Heichal, then they would send in Levi'im to remove it, and if there were no Levi'im, they would send in Yisraelim.2)
(a) From "*Ach* el ha'Poroches Lo Yavo (ve'El ha'Mizbei'ach Lo Yigash)" - Rav Kahana learns that, even though a blemished Kohen is forbidden to enter inside the area between the Ulam and the Mizbei'ach for the Avodah etc., he is nevertheless permitted to enter even within the Paroches (of the Kodesh Kodshim), to make new gold plates to cover the walls. Initially, it should be un-blemished Kohanim who are sent in; but if there are none, then even blemished Kohanim may go in to perform the task on hand; and if no Tahor Kohanim are available, then one may even send in Tamei Kohanim (but not Yisraelim). Note: This appears to clash with the opinion quoted in 1.3)
(a) 'Rebbi Shimon Omer, Makom she'Hitiru Lecha Chachamim, Mishelecha Nasnu Lecha; she'Lo Hitiru Lecha Ela Mishum Shevus' - refers to the Sugya above 52b, where the Tana Kama forbade someone who is even one Amah outside the Techum of the town when Shabbos enters, to enter. Rebbi Shimon there permitted him to enter because of To'ei ha'Midos (as we explained there). Here he gives the reason for what he says there - namely, because Chazal are only giving him what they took away from him in the first place (the fifteen Amos 'error' that were made).