These are good videos but you have to turn the sound off.Missing something at metal polishing? Yes, you're missing that this is not to polish but to resurface the cilinderhead that is being treated! And bytheway; that is not a sandblaster but a simple watercompressor.I hope you're open for some feedback: It's really not necessary to comment every single scene. Do it only on those that are indeed really impressive or where you really have no clue at what you are loooking at. Otherwise all those "Totally Awesome" "Magical" "Incredible" shoutouts really get boring and dumb pretty fast. Especially when what you say is simply wrong. For example "Cutting with water". It's not just water. It's a mixture of water and silica or sand.