The image below is the style of pipe I am using to connect the fans to the flymo.
To make the pipes, start off with a cylinder and inset and extrude then inset again and extrude down then inset a small amount. Then to make the thread, use the bevel tool and bevel inwards and outwards to get the result in then image below and rotate those polygons to make the slanted.
To create the body of the pipe, use a line to make the shape as seen in the image below and then fillet the 2 corner vertices. Then turn on view in viewport and render and set the thickness. Turn it into an editable poly and attach it to the base and weld the vertices together (make sure they are inline first).
The highlight the corner vertices and extrude them and extrude the edge lines a tiny bit more to create the edges and then add support loops.
Create a cylinder to the base (which will be the base of the bolt). To create the bolt, create a cylinder and give it 6 sides. Add turbosmooth and some support edges then inset the top and bottom polygons and then use the loop regulizer (my hot key is Shift+1) to create the circle on the top and extrude it by a small amount.
