Homemade A Chain Wrench

[Toolmaker51]

I [probably a lot of other readers too] would like to see the weld torch and it's operative set-up.

Watching the video, I googled fingertip TIG torches and found a variety but not quite like your's. Some looked clumsy; what you have seems like ideal ergonomics. Here [US] liquid cooled torches are common, they combine a sealed reservoir, circulation pump and a radiator. Different parts, but otherwise very much like cooling an auto engine.