is tevo tornado hotend cartridge 12v 40W or 24v 40W ???
I agree with Roplcosu, the Tornado is 24v and you bed is AC (220v or 110v) depending on your country.
IT IS 24V, the power supply is a 24v, so all fans and heaters (other than the bed) need to be 24v, and the bed is your local mains voltage
a left and a right shoulder and a smaller one stacked..
i dont know if i coat them with abs glue or leave them as they are..