Responsa for Chullin 107:1

וושט נקובתו במשהו דרוסתו במשהו

With regard to the gullet, as the slightest perforation [is sufficient to render the animal trefah], so too is t slightest indication of clawing; but with regard to the windpipe, since [it is established that] there must be a hole the size of an issar,<span class="x" onmousemove="('comment',' V. next MISHNAH:');">¹</span>

Shut min haShamayim