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pick the surface that ends the tube as your sketch plane and insert sketch
convert the outside edge of the tube to the sketch so have that circumference on its own sketch now go Insert - Curve - Helix spiral
from there it you set up the spiral that is going to define your thread you then draw the shape that is going to add material and use a sweep to follow your spiral and leave you with the threaded end.
For "Thread settings" select the edge (exterior or interior - where must be your thread) and the diameter for the thread (10 in your case). Click OK and that's all.
I useSW 2007 and sometimes I can see the thread and other times no. But in drawing the thread is ok. Maybe is a little bug or I do not know everything about threads in SW.
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