In 17-32, the corners traditionally set one bar to the person you just passed, then one bar to the next person to pass. In a variant for [19-24] 1c turns BH in PdB.
Unofficial: On 2nd turn, 4c has an easier next start if 1c+3c+4c dance a 3C Poussette
The first two turns are in Strathspey time, the second two are in Reel time.
Note: on  the original says »RH«, but »BH« is widely used.