I'm building a roller for a "pool" cover I got at home. The cover weighs 10kg (8kg but I'm considering some weigh added by the water present on it). I have a bosch profile structure where I will support it.
Now I need to choose a pipe. I don't know which pipe to choose. Will a steel 35mm diameter with 1.5mm thickness pipe does the job without deflection? Should I increase the thickness or the diameter? The tube lenght will be 4m.