It does exist? I don't have an Esterigon but a 18350 VIR device would interest me. What apart from the adapter would one need? 18350 body locking cap venting cap atomizer cap that "VIR Esterigon adapter" that's it? how I understood it the positive spring-loaded pin is the same in proteus and esterigon - so I could use that from Proteus and of course VIR. anything I'm missing? ah, the button and LED-cover. would I be able to use those from Proteus as well in your adapter?