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CO 64 sts
14 rounds 1x1 rib
begin broken rib (2 row repeat: knit one round plain, k1p1 around)

60 rounds for lef

heel flap over second half of next round
knit until 17 sts in each slipped stitch column
dec every other round for gusset BOR at center of heel)
knit foot for 58 rounds, then follow toe shaping from Cyril socks for a rounded toe

I did accidentally decrease down to 68 sts for the foot of the second sock (versus my intended 64 sts for the first sock). I didn’t realize it until I started my toe decreases, and since the fit it okay/similar, I opted not to reknit the entire foot (these socks had been a WIP long enough).

heel turn calculator for a French heel