Quoting%20commentary for Menachot 69:4

וצריך שיגיע חריץ למקום התפר רב דימי מנהרדעא אמר כיון דמנכר לא צריך

Abaye said, The duct<span class="x" onmousemove="('comment',' Each tefillah, it must be remembered, is in the form of a square leather box upon a base, that of the hand consisting of one compartment and of the head of four compartments. In order to obtain the necessary shape (usually in the form of a cube) a mould or frame is used over which the skin whilst moist and pliable is tautly stretched. On being removed from the frame the skin is cut around to an equal length on three sides, whilst on the fourth side there is left a long strip of skin which, after allowing for a projection on this fourth side in order to provide a loop or a duct through which the straps are passed, is bent under the whole box so as to form the underside or the base of the tefillah. After inserting the necessary texts into the several compartments the base is stitched carefully to the extremities of the box on three sides.');">⁴</span> of the tefillin is also a law given to Moses at Sinai. Abaye also said, The shin<span class="x" onmousemove="('comment',' The letter shin must be embossed on the right and left sides of the head-tefillah. The shin on the right side (when worn by the person) is of the usual shape, whilst the shin on the left side has four heads, thus **.');">⁵</span>

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