To Avi K who wrote: “As for making a kesher on Shabbat, if it is undone whenever removing the tie it is no problem as it is a maaseh hediot (anyone can do it) and temporary.”
Not exactly.
One may tie (and untie, not that you asked) any knot that isn’t strong and is meant to be untied within twenty-four hours of its being tied. Sh’miras Shabas K’hilchasah 15:52, :55. (However, :58 seems to contradict this).
Some people may leave their ties knotted even when they take them off for the night and then just slip them on in the morning. One would have to make sure not to do this on Motzei SHabbos if it was tied on Shabbat.
Same for shoe laces, if they were tied on Shabbos, they must be opened within 24 hours.
BTW – this is why some people are machmir when they get glillah at Shabbos mincha not to make a slip knot on the Torah, but to tuck in the gartel, since the Torah won’t be used till Monday. See Minchas Shabbos 80:155.
According to this view, it is also prohibited to knot a Sefer Torah band in this fashion on Thursday, since it has be untied on Shabbos morning.