How to model a screw in Maya with quads (subdividable)

Link to Part 3 of modelling an iPhone 11:    • How to model an iphone 11 in Maya Par...  
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Part of my 'Modelling an iPhone 11' series, we use a pipe, cylinder and a helix to create a detailed and neatly modelled screw. No Booleans were used in the making of this tutorial.

Difficulty: Near-Beginner (you should already know how to move, go into vertex & edge mode and extrude) If you are having any difficulty, watch this tutorial first:    • Intro to Modelling in Maya: Final Fan...  

HDRI lighting image used in tutorial available here: http://tiny.cc/hd8uez

Note: to save on poly-count, you can isolate select the helix, and delete the faces on the inside. (shift+double click on an adjacent face selects a whole line of faces).