588. Winding Clocks and Watches

In an introductory note to this chapter, the Kitzur Shulchan Aruch writes that most Jews are already familiar with the prohibited labors of Shabbos and that he is only addressing common situations with which people may not be familiar. Clearly, the laws of Shabbos constitute an area requiring much greater study than this email alone will allow. 80:85 If the leg of a stool becomes detached, it may not be reattached on Shabbos (not even loosely - Mishnah Brurah 308:68.) One may not even support the broken stool on another stool unless he has previously sat on it that way. (One may sit on the broken stool "as is" without moving it -MB 308:70.) One may place a board across stools or on pieces of wood that were designated before Shabbos for that purpose.

80:86 A timepiece may not be wound on Shabbod or yom tov, even if it's still running. (One may likewise not shake a stopped pocket watch to get it started again - Mishnah Brurah 338:15.) One may be lenient in this matter on the second day of yom tov so long as the timepiece is still running; this may be done for the needs of the day but not for the next day. One should also act leniently when it comes to the needs of a sick person if one can't easily find a non-Jew to wind the timepiece. (A non-Jew may wind a timepiece needed for a sick person even if it has stopped completely - MB ibid.)