Atmos Tutorial. Nozzle replacement/Inlocuire duza Atmos DC30SX

Tutorial on how to replace an aged and less efficient nozzle inside of a Atmos DC series boiler
Spear part used, code: DC0125 ATMOS
As provide by ATMOS, the nozzle will be packaged with white glue, and 3 sealant ropes (2 for nozzle sides and 1 for the top end)
The triangle marked (can be circle, or 3 circles, whatever), should be on top of the air duct of boiler as in this movie.
It too almost 5 hours to get the old nozzle out, hammering drilling a lot of holes just to crack it and make it apart.