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Cutting LARGE openings in stainless steel firewalls ?

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Jerry

Radial Skybolt Builder: 220.45% completed
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I need to cut triangular openings in the firewall for my engine mounting brackets. I've drilled small holes in stainless without a problem in the past.

Any suggestions as to the best way to make these holes; Three holes and connect the dots with straight lines? But with what type of tools; holes saws cutter ? Unibit ? What ?

Thanks !
Jerry

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