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Aligning the gasket with the seat gets you a complete seal and no blockages that would hinder flow through the seat. Most newer Tillotson carburetor will self-align the gasket, so you do not need this tool.
718 The .125 x 2 dowel pin is for older carburetors that do not align the copper inlet seat gasket. This tool is used in conjunction with the 36A-38M Inlet Seat.
36A-38M Inlet Seat (Short) Machined. This is not a functioning inlet fuel seat but an inlet seat modified to allow the 718 dowel pin to slide through to align the copper inlet seat gasket. Do not attempt to use this in a running carburetor as the inlet needle will never sit, and you will have a terrible flooding condition.