Riveting pcb holes - engineering type input sought!

[magicniner]

Was just looking for the makings really, it's a simple job to chuck these on a mandrel in the lathe,remove the serations and even skim the flange OD if that's too large.

You don't need to skim the serrations, you need to adjust the drilled hole size to suit the material you're using to avoid splitting, you'll still have significant resistance to turning from the mechanical fit, add a 2-part adhesive for adequate retention and you're sorted.

thanks but they looks broadly similar to the nuts I referred to in my opening post..

If you use a backing washer, as I stated, the hollow section spreads and partially collapses outside the washer and doesn't spread in the substrate, no stress on the hole, just compression of the board, so no splitting.
I guess that's similar ;-)