I like the "shoulder" - means it "bottoms out" before being swagged.
I believe the spark plug versions are available with a tapered face to suit that style of plug.
The also do a "Thick sert" version, for previously repaired threads. Handy for old, previously refurbed, MX bikes.
Great to know this stuff is available.
I'd love a "sticky" on thread repair options.
- "Nutserts" for sheet metal
- Atlas "Spintight" for thicker/blind applications (found the info, but no supplier in Aus)
- helicoils (got a cheap Helicoil remover on eBay - works well)
- The above "Time sert/Thick sert"
Old school - weld/braze, drill, tap