Yesterday afternoon a book arrived in the mail - Robert A. Hall Jr.'s Leave Your Language Alone! in its first hardcover vanity press edition (Linguistica-Ithaca, NY).

Congratulations Wordwind, your final form of Tillie's sentence had only one major error, namely...

USE A DASH INSTEAD OF A COLON WHEN THE SIGN IS SIMPLY A SUBSTITUTE FOR "NAMELY".
A COLON SUGGESTS AN INCONGRUITY WHILE A DASH IS MORE CONGRUENT.