Wrench / Spanner for 9mm extruder nozzle

See Thing 3453917 for a holder and nozzle storage to complement this.

This is a knurled holder to take a 9mm socket and allow simple changes of extruder nozzle. My socket is 12.9mm external diameter and came from a Draper set.
I glued a small nut into the socket so the thread of the nozzle is above the rim which makes it easier when screwing the nozzle into the extruder.