On my new to me TAZ 5 I had to change out the nozzle to a new size. I was kind of dreading after reading all the concerns on here. Nothing to it. Heated the nozzle to the filament temperature, applied two wrenches and removed. Turned off the nozzle heater, unscrewed.nozzle… used my very thin gloves used for when I TIG weld, it was still a little toasty on the fingers, started the threads by hand and snugged it tight with the wrenches. No thread sealer or LockTite blue and it tested fine with no leaks.
Gotta love lamb skin TIG gloves.