The CK gas saver won't allow you to turn your flow rate down but it makes the gas flow more laminar - It comes out in a smooth line rather than tumbling around. It means you can use more stick out with the same flow rate.
Langy is selling series 2 (Fits a 9 or 20 torch) Pyrex consumables with gas lenses.
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A few people on here use a CK head and CK superflex cables but a Weldcraft handle because it's more ergonomic.
I was just going on what I've heard from others, I only replied to "Bump" the thread so more knowledgeable people (Like you) would come alongHmm not so sure about not being able to turn down as I've gone down to 3.5lpm since I changed over, have you tried the CK yet ???
Why not use a more robust Weldcraft Gas Lens