Crochet six single stitches onto the slip knot loop. Then tighten the loop and close the circle with a slip stitch. Elsewhere in the crocheting world this is called a "magic circle." You should count six stitches including the stitch your hook is in. 
The most simple, ancient, and powerful throwing tool in the world… under 2 ounces
2014/03/02
How to crochet a twelve row buckeye slingball. Step 2
Crochet six single stitches onto the slip knot loop. Then tighten the loop and close the circle with a slip stitch. Elsewhere in the crocheting world this is called a "magic circle." You should count six stitches including the stitch your hook is in. 