One way would be to use the Unlock Cursor, which allows you to edit the objects that make up symbols without affecting the symbol hierarchy.
Choose the Unlock Cursor ( or F9) then click on the text and set the Text Height you want in the Properties Grid.
Be sure to return to the normal cursor (Escape) when you have finished using the Unlock Cursor.


Kind regards,
Rob Robinson
Stardraw.com

Hello,

Is there a way to adjust the size of text within a feather?  

For example I have the following which is to large for the feather.