Started with Hiya Hiya 9” circular US 2 in order to get gauge.
Changed to US 1 1/2 (2.5mm) for heel and foot.
Did heel flap as written.
For heel turn:
Row 1 (ws): Sl 1, K6, P2, K6, P2, SSK, K1, turn.
Row 2 (rs): Sl 1, P3, P2tog, P1, turn
Row 3: Sl 1, K4, SSK, K1, turn
Repeat rows 2 -3 until all stitches are incorporated.

On rnd 16 of the foot, instep:
I did not do the first symbol (p2tog) of the edge stitches of the chart.