An auger is a rod, bar, pipe, etc. - around which a helix is attached. This is commonly two pieces of flat wound like ribbons. This is what a post hole digger looks like and works quite well.
If you want to make a wine corkscrew shape, forge a point on a round bar, then wrap around a tapered mandrel. The corkscrew will now be at right angles to the bar, so you have to bend at a 90 and then center it so the screw will be centered on the rod. Look at a dog anchor at a pet store and you'll see the form.
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