Stripped bolt on firewall for Voltage Reg.

Mattax said

Found my notes - stuck in Carrol Smith's Nuts, Bolts, Fasteners

Audel - Stanley Engineering
Nutsert® breaks into two halves during installation. The bottom half swages the top half.
TSN® Thin sheet nutsert expands the tip into a bubble.

AVK
A-T Series. Knurled insert that swages the tip (similar to Nutsert) Best for minimal protrusion in the back.
A-L Series Knurled expanding insert
A-K Series Knurled expanding insert with reduced head
made in the USA

Marson
Klik Rivet Nuts

I bought the AVK 'expendable' tool AAT916 and a small bag of the AK series for 1/4-20 from Zoro.

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Many of those rivnut nutzert products can be installed without expensive tools. buy yourself a good quality stud to fit the insert, use something appropriate for a spacer (reamed out nut, etc) and a good quality nut at the top. Oil it and tighten 'er down. It will pull into place. "Practice" a bit with some scrap.

We use the AVK inserts at work, but only in 10-32. We have a 'rig' to install them, but sometimes I've installed them singly for one reason or another. If you screw them up, they can be ground or drilled out