Hi Adam
I used to have one of these. A different brand maybe, I don't remember, but more or less the same. It was designed to clamp to the centre divider in a 1950s concrete wash trough. The water jet blasts onto a turbine cast into the base of the spinning drum.
You just lift the drum up off the centre "spike." The centre pole of the spinning drum is a hollow tube, the spike runs up the centre, there are bronze bushes inside the hollow centre tube. Oil inside the tube and all should be well. Use sewing machine oil, not grease or heavy oil. The lighter the oil, the less friction there will be and the faster it will spin. (still not very fast...)
the copper pipe - is that for a spray rinse? Mine didn't have that. It looks like you press the button in on the end and it will spray water on the spinning clothes??