Glass cutter ?

Depends on the quality of the hole saw and how well you take care of it. I have one that has around 20 holes cut.
 
It kills me to hear LFS,s charging $25 a hole and not including bulk heads or anything. I'm going to offer $15-20 per hole with the bulk head included on my nano,s.
 
I always drilled the holes for free for local members of our forum. I always said throw me some gas money if gotta drove to you otherwise om not responsible for any tank breaks while drilling lol.
 
As long as your using quality bits and you let the bit do it's job using even pressure and keep your bit wet I have some bits that are over 20 years old I still use and they cut great still.
 

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