You can do it with a metal blade on a jigsaw if you're patient and can hold your hand steady.Lok'i Vidaar wrote:heh. Buy a 4 3/4" holesaw ;)
and use a 120mm fan... too bad a holesaw that big is rediculously priced.
If you've got arms like Schwartzenaegger, I could loan you my Roto-Zip with the metal bit in it. But good luck keeping THAT line steady.