[THEBERBSTER]

A Warm Welcome To The Subsim Community > Brian Jones
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Tutorials And Other Information Links In My Signature Below
You need to go to your main game folder then to data/textures/TNormal/tex
You will see the sub flags here.
Go to properties and it will give you the size that the flag needs to be.
Make copies of the flags you are replacing noting their names.
Note that the flags are positioned upside down.
I am assuming it is that simple, however it may not be!