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The last knot on the tzitzit on my talit keep coming loose. I pull the string to tighten the knot, and three days later it starts to unravel again. Any ideas on how I can make the knots stay tight and not loosen?

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The best way which works for me is by taking the last knot and dip into hot water ,then I tie it tightly. I have yet have a knot open. Simple and easy. Don't know why this isn't more known and implicated in the tzizts factories.

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  • When I was a bochur in Denver Yeshivah, R' Kagan told us to dip it in hot boiling water as well.
    – David Kenner
    Mar 14, 2018 at 15:22
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    I dont believe it makes a diff if its boiling or not. I personally just use hot water and it works great.
    – sam
    Mar 14, 2018 at 15:23
  • +1 works for me with cold water too, but hot water is probably better. I just turn on the tap water, tighten the knot, and stick the knot under the tap.
    – aBochur
    Mar 14, 2018 at 17:02
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    If I'm not mistaken, tziztit are usually made from wool? The boiling water makes sense, then. Ever notice that when you put a wo0l sweater in the laundry with hot water, it shrinks? There's probably a reason why sheep like to huddle together. Wool makes each other warmer :-)
    – DanF
    Mar 14, 2018 at 17:27
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    I took your advice a few days before Pesach, and here it is a little after simchat torah and they're still staying put so this advice has survived the test of time. Thanks.
    – Popular Isn't Right
    Oct 9, 2018 at 15:34
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If your double knots are frequently slipping open, they might be granny knots rather than reef knots. That is, if both layers of the double-knot are tied with the same side on top, the knot is much less secure than if one layer has left on top, and the other has right on top. Untying the second layer, switching which set of strings goes over which, and retying may solve your problem.

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  • +1 I remembered seeing a granny knot discussion here once and couldn't find it again. I see it was that comment of yours on the other question.
    – user6591
    Mar 14, 2018 at 15:33

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