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M2: Slightly smaller '2' Rim diameter, standard bowl shape "C" cup, 24 throat and Schmitt backbore.
M2*: LARGER Schmitt backbore with a shorter throat in a 2 rim diameter. More open feel.
M3: Slightly smaller '3' Rim diameter, standard bowl shape "C" cup, 24 throat and Schmitt backbore.
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