[27b bottom] Gemarah: If the sound of the shofar was naturally thin, rough, or thick, all these sounds would count. Additionally, if one made a hole in the shofar horn and then blew into it, these sounds would also qualify.
T’s lesson: The Gemarah shows cases of a shofar that is not perfect but still is valid to be used. We should learn from here that all Jews are considered valid before Hashem no matter their imperfections, faults, and cracks in their linings. Hashem considers us all dear to Him and Kosher just like the non-perfect shofars in our Gemarah.