Quoting%20commentary for Menachot 69:13

אמר רב הונא תפילין כל זמן שפני טבלא קיימת כשירות רב חסדא אמר נפסקו שתים כשירות שלש פסולות

For we have learnt: If a man made his tefillin round, it is a danger<span class="x" onmousemove="('comment',' For if he knocks against anything the round head-tefillah would pierce his skull.');">¹⁶</span> and it is no fulfilment of the precept!<span class="x" onmousemove="('comment',' Meg. 24b.');">¹⁷</span> - R'papa said, That [Mishnah] deals with the case where they were made round like a nut.<span class="x" onmousemove="('comment',' I.e., the underside was convex and oval and did not lie flat on the head. In that case only is there a danger, but not where the base is flat and only the box is made round like a cylinder.');">¹⁸</span>

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