How to change the liquefied gas of Black & Decker civil gas stove into natural gas?

Changing liquefied gas into natural gas only requires changing the nozzle. You need to prepare a twist drill with a diameter of 0.7mm, 1.35mm, and expand the small nozzle hole of the inner ring fire to 0.7 and the large nozzle of the outer ring fire to 1.35. I have worked as a certified engineer for cooking stoves, and I am familiar with this aspect. This data is the most widely used and mature, but it must be remembered that the drill bit of the outer ring nozzle must not exceed 1.4mm, otherwise there will be severe working conditions of excessive flame and unclean combustion. If it is not too big, the outer ring fire can use a 1.3mm drill bit.