I believe what Mike is referring to is this...
The overhand sell out is similar to the throwing motion for throwing a ball. Left-handed umpires can look pretty clumsy doing this right-handed. Therefore, since ASA believes the mechanic is important, and that it look authoritative, they allow left-handed umpires to perform the mechanic left-handed.
This is discussed on p 234 of the Umpire Manual section of the 2005 ASA rule book (Umpire Edition), in the section about the sell out call.
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Tom
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