Neil
Supporter
It is probably too late to consider alternatives at this point, but AVEX rivets are my choice for blind rivets. They have a retained stem which improves their shear strength and the stems won't vibrate loose, Their grip range is unusually long and they are available in many head styles and alloys. https://www.austinhardware.com/avex...0VqPWWiScfh8anTn9EbPrKjsL3U-Y2PA2UB66CHl9UPEb