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Re: Where to Start? Firewall Repair
Number 4 looks the best to me. Its sheet metal so if you don't penetrate 100% it isn't going to be a big deal.
I doubt your fit up will be that nice when you actually cut a patch in (it takes a ton of time and practice to get that perfect fit up). If you have a gap of .030 you will likely burn through with the setting for number 4. Play around some more with a bit of a gap. You will see a lot of differences with penetration and profile with the different gaps and settings.
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