Summary

Yosef Chaim Ben Ish Chai — Year One: Bereishit

Then first grab the two on the right and cast them behind you to the left, so that they be wrapped around your neck over your left shoulder to the back, while the two left ones remain hanging in front of you, and wait the short time length of walking four amot or slightly less, then follow by sending the left ones also behind you to the left, so that now all four corners are hanging behind you together on the left, and wait the time of walking four amot and then let the tallit that is wrapped around your neck go down over all your body.
Source: Wikisource

Yosef Chaim Ben Ish Chai — Year One: Bereishit

However if he removes it in order to enter the bath where he will stay long, it is preferable to say the berakhah as the Arizal did. This is what I brought up in my holy book Mekabtzi`el. But if he changes his clothes and dons a different tallit katan, even if he dons it immediately after removing the first one, he should say the berakhah on the new one, an this too is the rule with a tallit gadol if he removes the one that is on him and dons a different tallit gadol, he should say the berakhah on the second one.
Source: Wikisource

Yosef Chaim Ben Ish Chai — Year One: Bereishit

Also further one should be careful to check each day and look at the strings at the top at the foundation at the hole, because if even one is severed there they are is disqualified. And in a pressing time, when he is late to come or the tzibur/congregation is waiting for him to do petichat haheichal/opening the ark or to read the Torah he can rely on on a chazakah and not check that time.
Source: Wikisource

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