I used this thread to make a screw thread on some cylinder. The acccepted answer poster say that the method will leave 4 ngons at the end, that could be solved to quads with some thoughs. Even if the result is acceptable with thoses ngons, you still can see a little flaw in the shape once subdivision is added.
After many tries I am not getting it right, and more generally, I have a hard time with retopology and understanding edge flow. How would you get rid of thoses ngons ?