Thanks, agricola, I'm alwqys intersted to hear/read about new, to me, technology. Not that I'm likely to use aerospace type pop rivets, but anyway.
Here's all about Cherry rivets:
http://www.peerlessaerospace.com/pub..._CHERRYMAX.pdf
Q: Why are US parts sized by No.? These are 4, 5, 6 or 8, which bear no relationship to a whole number of mms or fractions of an inch, except in thou. It's as bad as Standard Wire Guage:
http://www.clag.org.uk/swg.html
John