I use a short piece of all thread and my battery powered 3/8" drive impact wrench. Just carefully tighten a nut and flat washer against the rivnut- - - -no installation tool needed. Just drill the hole the right size so the thread insert is a snug slip fit.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!