Originally Posted by
MikeX
I really don’t like the idea of installing rivet nuts. Any hole you drill is an automatic 3X minimum stress riser. Not a good thing in a fork. That’s why in traditional frame building practice there were always little (usually) diamond shape reinforcing plates around the bottle cage threaded holes and such. If you want to go there anyway, a good source for rivet nuts and aluminum “p-clamps” is Aircraft Spruce; http://www.aircraftspruce.com/. Almost all aircraft stuff is English threaded, but a #8-32 tpi thread is an almost equivalent to a 5-0.8 mm thread if the fit isn’t too critical. Aircraft Spruce also carries an alternate to rivet nuts called Nutserts. The p-clamps are listed as MS21919 clamps. The ever popular and flame attracting Rivendell has some racks and bits that might be useful to you: http://www.rivbike.com/.
I agree about the inadvisability of installing riv-nuts in the stressed part of a fork blade. Note in Dan's video, he is placing the rivnut in a very low stress area.
BTW, it's a minor point but an M5x0.8 bolt is closely approximated by a #10-32 SAE bolt, not a #8.