I only use Ck consumables as there angled collets are the best around. I bought way too many as I'm still yet to consume the first one. They all fit the weldtec torches fine. The double seal is on the back of the torch itself and doesn't effect the standard fittings.Ah cool that's good news as all my current consumables are CK.
Do you mean like a loose back cap?High amps won't kill them, letting them get loose could.
Same as ckHow flexible are the torch leads