1/1 RC worked without cable needle as follows: K2tog, leave on LN; knit the first of those sts again before slipping all from needle. Alternatively, knit second st on LN, then 1st st before slipping all from needle.
If purl sts in rows 2 and 4 are knit instead, a flatter fabric results, with a more subtle spiral, as the upper portion of the swatch shows.
Shown with a cast-on count of 10 stitches.