Video Tutorial

Round 1: Chain 16
Round 2: 14 half double crochet, chain 5
Round 3: Front loops only, 4 single crochet, 14 half double crochet
Round 4: Back loops only, 14 half double crochet, 4 single crochet, chain 6
Round 5: Front loops only, 9 single crochet, 14 half double crochet
Round 6: Back loops only, 14 half double crochet, 9 single crochet
Repeat round 5-6 to round 17
Round 18: Back loops only, 14 half double crochet, 4 single crochet
Round 19: Front loops only, 4 single crochet, 14 half double crochet
Round 20: Back loops only, 14 half double crochet
Round 21: Front loops only, 14 half double crochet
Round 22: Back loops only, 14 half double crochet, chain 5
Round 23: Front loops only, 4 single crochet, 14 half double crochet
Round 24: Back loops only, 14 half double crochet, 4 single crochet, chain 6
Round 25: Front loops only, 9 single crochet, 14 half double crochet
Round 26: Back loops only, 14 half double crochet, 9 single crochet
Repeat round 25-26 to round 37
Round 38: Back loops only, 14 half double crochet, 4 single crochet
Round 39: Front loops only, 4 single crochet, 14 half double crochet
Round 40: Back loops only, 14 half double crochet
Fasten off