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Many times, for those who have two double knots with eight strings in each knot (i.e. not following the opinion of the Rambam), the knot starts to come loose often, sometimes even several times a day. If it is not tightened, occasionally it will completely come out by the end of the day.

My question is, if someone notices on Shabbos that their tzitzis knot is coming loose, and is slipping down the strings, can they slide it up closer to the top, without tightening it, so that it won't come completely undone and begin to unravel further?

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This ehow explains how to tie tzitzis. At the end it says, "Tips & Warnings Wet all of the knots with boiling water then let them air dry. This will make the knots dry tighter and stronger to prevent unwinding." The threads shrink as they dry and this is what tightens the knots. I am unsure as to whether boiling water is essential or lower temperatures are also effective. –  Avrohom Yitzchok Aug 12 at 20:19
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If your double knots are frequently slipping open, they might be granny knots rather than reef knots. Untying the second knot, switching which set of strings goes over which, and retying may solve your problem. –  Isaac Moses Aug 12 at 20:20
    
@IsaacMoses, just not on שבת. –  Seth J Aug 12 at 20:21
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@SethJ, indeed. The fix I suggest should be done on one of the other six days of the week, to alleviate this problem happening on Shabbat. –  Isaac Moses Aug 12 at 20:22

2 Answers 2

The book The 39 Avoth Melacha of Shabbath* has an illustration that specifically forbids this (as Rabbinic, IIRC). If you have a copy, it sources every statement.

* Yes, it is targeted at children, it is still well sourced, even if it only picks one opinion to go with (generally the Mishna Brura) and eschews ambiguity.

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+1 does the book have a sources section where it cites a source for this ruling? also if you can, including the page number with the illustration will improve your answer. –  Double AA Aug 13 at 0:04
    
@DoubleAA, it is on the page about the melacha of Kosheir. Every Melacha gets a double page in the book. Sources are all in the back appendix. I'm going from memory, so I'll have to double check. –  Yishai Aug 13 at 1:45
    
Somehow this didn't show up in my messages box. +1, and a great book. If you can look up the source, would be appreciated –  YEZ Aug 27 at 3:38

If the knot is high up to the top and if it is about to be undone you can bring down lower but do not tighten it. Shulchan aruch harav hilchos tzizis

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Can you give edition, chapter and paragraph numbers? –  Double AA Aug 13 at 0:04
    
i will try to find –  Dovid Benizri Aug 13 at 0:21

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