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<li style="text-align: justify">Question: [Sunday 2nd Menachem Av 5781]</li>
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The hinges of the door of the shul are making a very squeaky noise which is quite annoying and disturbing people who are Davening. May I pour oil onto the hinges on Shabbos in order to get rid of the squeaky?
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Answer: 
It is forbidden for you to do so due to the prohibition of Tikkun Keli
Sources: SSH”K 23:43; 28:53 ; Shraga Hameir 6:101; Piskeiy Teshuvos 313 footnote 58 and 69

Shulchan Aruch HaRav | From the Rav’s Desk: Oiling squeaky hinges on Shabbos

Question: The hinges of the door of the shul are making a very squeaky noise which is quite annoying and disturbing people who are Davening. May I pour oil onto the hinges on Shabbos in order to get rid of the squeaky? Answer: It