A Hole Saw of the exact size you need is fine if it is a new hole.   Otherwise  
a jig saw would work.  

John Oppenheimer <[EMAIL PROTECTED]> wrote:  How does one cut a 3 1/2 inch 
instrument hole into a fiberglass bulkhead?

It's a very common process but I've never seen it done.

John
C27 5956 Cool Change
Austin, TX



Change your thinking, change your life. We are guided, we are guarded, we are 
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