Hot answers tagged tying-knots-kosheir
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.
Try: ספר תפלה למשה והוא אוצר הלכות הנחת תפילין ולבישת הציצית חובר בס"ד ע"י משה קרויזר
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
Actually there are others who were concerned over the issue, which, as SethJ notes above, is referred to as notef al hakanaf, meaning it should hang down along the side, not from the bottom. The Chazon Ish held that you should tie the first knot really snug so that it bunches up the fabric, and that way the tzitzit won't budge. You see a lot of avreichim ...
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