Hi I had my S200 highly modified by XTX Air - nice chap called Darrin he's on here. Darrin regulated the cylinder and fitted me a gauge at the front it was a mk1 cylinder. The mk1 requires filling by removing cylinder Darrin did a quick fill conversion so I don't have to remove cylinder. Use XTX.
“Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a fruit salad.”
The real Peaky Blinder