Best/Safest way of fixing a Camping Regulator to avoid damage

This video will teach you the best/safest way to fix a camping regulator to avoid damage

[@c-cotcmt5375]

Can you do the same for a 12.5kg gas cylinder?

[@paulikenna2470]

Yes so far as the 12.5kg cylinder still have the same camping valve

[@streetwisetailoring5338]

I have a gas cylinder that once I switch on the regulator I start to smell gas, I v changed the rubber on the head of the gas, I v changed the regulator. Once I close the regulator the smell goes away. The only time I hear sound is when I place my ear on the regulator.. Please what do you think is wrong