jannek Without going out to check in my workshop (my legs aren't working today), the bolt is a direct replacement for the one on my Chinese 7" X 14" mini lathe. It's the same one that can be bought form a variety of sources in many countries, but rebadged.

jannek The argon supply should have its own regulator on top of the gas tank. The air supply is only for the plasma torch.

jannek My understanding is that it can be supplied in either flavour with 220 being the default. Don't forget that to achieve full output current it will have to draw twice the current from a 120 supply compared to a 220 mains supply. Fortunately the 50H Vs 60Hz mains supply has little effect on the unit.

jannek Simple answer: No but you might be able to add one. Whether it works or not ...

jannek On looks alone, this lathe appears to be a clone of the ubiquitous 'Chinese Mini Lathe' that's available in several sizes and and rebadged by many other 'manufacturers'. As such I cannot see why it wouldn't fit and work as well as, if not better than, the OEM tool post holder. Once each tool has been set up, the flexibility of the tool holder is well worth the money. I have 2 of them, one of which I have modified to take 'professional' tooling!

jannek In theory any CUT50 should be able to tackle a greater thickness of material Vs the CT312. So far I've only done a little playing around with my CT312, but it went though 10mm steel faster and cleaner than my oxy-ace torch! How long either cuts before they overheat is unknown to me at the moment. What I can say, is that the isolated tip means that there's no danger of shorting out the output and no need to keep a set relief from the material being cut. To me that makes the CT312 easier to use and (unless a CUT50 can be found with the same facility) the superior product.

jannek The button goes from normally open to 'momentary' closed while it's pressed. Release it and it opens again.

jannek In terms of psi, it's rated @ 80 - 100 depending on the thickness of cut. I think you'll need at least 5cfmin for a reasonable cut on short cuts thin material and closer to 10cufmin for extended use. So far I haven't used the machine much due to other work. My compressor is a medium sized hobby unit, but I have extended the storage to double that. One day I will put a video of me using it in all it's abilities on my You Tube channel.