[gudgeonpin]

Riv nut is a rivet nut uses tool like for pop rivet. Perfect if you cant reach back of things to hold a nut.

And yes the capillary action on all pivots and heims wicks it in there, and moves freely. Oil seems to wash out after 1 car wash.  Trying WD Gel lube, seems to be holding up

Thanks-  The rivet nut looks interesting.  Is a sleeve on the outside of the threaded portion?  From the pictures, it looks like the tool pulls on the inside threads and maybe mashes an outer sleeve to form the rivet.  It looks like a more substantial fitting than something like a Dzus nut.