Tightening the dalet shaped, head knot:
(To loosen follow the opposite sequence.)

It is proper to say "L'shem kedushas tefillin" (for the sake of the
sanctity of tefillin) upon adjusting the knot.

Adjustment procedure for head tefillin knot

Adjustment procedure for head tefillin knot

 

Tightening the square shaped head, knot:

Adjustment procedure for head tefillin knot

 

(To loosen follow the opposite sequence:)

Adjustment procedure for head tefillin knot

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