glass hole saw

I have some that may work for you. They are sized in millimeters and I am not sure what size hole you need for a 1" bulkhead. If you find out what size will work, let me know. I live close by....
 
I used a 45mm for my 1" bulkheads. If you want to convert inches to millimeters just multiply the inches by 25.4

Measure the outside of the threads on the bulkhead (usually 1 3/4") . Then multiply 1.75x 25.4 = 44.45mm

Sounds like 45mm should do the trick but some bulkheads are different.

-- Kevin
 
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