Someone sent Gary one with a plug in that location about 3 years ago. I do not recall anything being said about it being drilled all the way through into the venturi. If that were actually done, as described here, then the pressure balance of the carb would be terribly upset as the space surrounding the venturi (that is, space between cast wall with plug & the venturi) is normally at vent pressure (same as intake opening), whereas as the inside of venturi is lower pressure generated as a result if air flow through the venturi. If those were ported together as this suggest, then the carb would not function or would function so poorly that the tractor would be unusable. You can demonstrate this effect by installing the venturi upside down such that it will not seal at the ends, as has been done unintentionally by persons in the past. Makes no sense why anyone would drill all the way through into the venturi itself. Especially, leaving the vent to inside venturi connection. Are you sure there was not a tube sealing into the venturi & simply passing through the space between the wall & venturi? This would be a very different matter, as then the two different pressure areas would not be connected to one another.
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