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> Welding on some nuts...
Scott S
post Oct 22 2010, 02:57 PM
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Hi All –
I cut the hole in my firewall for my conversion. I am going to attach the new steel access plate using screws on the interior, and then welding in some captured nuts on the engine compartment side of the firewall. Being that each nut will just get a quick zap of a couple of spot welds, do I need to worry about what finish is on the nuts (raw vs zinc, etc)?

Thanks!
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IronHillRestorations
post Oct 23 2010, 03:02 PM
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The nut inserts work great. Weld nuts are better but more involved. The fold over tab nuts also work without as much precision.

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http://www.aircraftspruce.com/catalog/hapages/tinnerman.php

Another trick is to drill a hole about four sizes smaller than the tap you want to use, and then use a tapered punch to get the hole close to the correct drill size (to bugle the hole) and then tap it for the size screw you want to use. This takes more time, and works best if you have someone back up the hole with a improvised mandrel.
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