1–
: 1c turn LH | cast off (2c up) ; turn LH 1¼ to between end couples, all C face P
9–
: All set to P | 2c+3c ¾ R&L **while{6}** 1c petronella to 2plx ; turn RH ¾ | petronella and face out (3,1,2)
17–
: All dance chaperoned chain progression, flowing into
25–
: Circle6 and back (2,1,3)

{{explanation}}
Chaperoned chain progression:  Developed by Tim Wilson and Tom Winters.  2c+3c dance a chain progression: Turn P RH |  3M+2W turn LH 1½ while{4} their P dance clw ½ round | 2c+3c turn P RH to exchanged places.  Meanwhile, 1M & 1W cast R and dance clw around the set, taking 3W & 2M respectively in promhold for bars 3–6.