what's a 'grommet installation tool'? usually that'd be a screwdriver, or for the ones with a small hole, something like an allen wrench that fits the hole snug
or do you mean the metal ferrule around the door handle?
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics