{{explanation}}
When setting in the centre, the turn is on the second PdB

1–
: 2c+3c (called “centres”) dance in and face diagonally in | set NHJ with turn R to face 1c+4c (= “cnrs”) ; all pass Rsh and face in diagonally | all set, cnrs swiveling R to face out
9–
: All pass Rsh and face in diagonally | all set, centres turning R about ; cnrs turn centres RH
17–32
: Centres LHA to face own cnrs again ; intersecting diagonal Reels4{12} (use ½ LHA in {2} to pass in the middle)
33–
: Centres change places with P LH (2W & 3M polite turn) to face new cnrs, set to cnrs ; turn that cnr by outside hand (centres pass through top/bottom of the set) back to centre facing each other diagonally
41–
: Centres set and 4 spring points ; repeat
49–
: Centres dance (NHJ) out at own ends and cast round to centre again facing diagonally in ; set and 4 points
57–
: Centres dance (NHJ) out at opposite ends (3c make arch for 2c) | cast L (NHJ) (2c round 4W and 3c round 1M), and on to own end of set (cnrs step in to centre places, to order 2,1,4,3)

{{explanation}}
Repeat once with new centres and cnrs  
In some areas the inner dancers who pass to corners stay facing out, and swivel to face inwards during the setting.