TIP: long stem, blind, snap rivet reuse.

For holding, through grommets, reverb tank to steel chassis, so not the usual small ones for DSP boards etc. You cannot reinsert, blind, as the

4 splay bits are permanently splayed out. Find a metal plate with holes the size to push each rivet in, to close back the 4 splays, then old soldering iron and hotmelt glue the 4 together. Reinsert through grommets and chassis, then the closer rivet, with more force than usual to break the hotmelt .