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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Thanks for that information. I think I'll give it a try. So brass is best for ground?