The Reuleaux Rotor

1–

1c long cast to 2pl (2c up on 3-4) ; 1c cross RSh | 1c+2cnrs ½ turn LH, 1c end on midline facing own side

9–

1M+2M+3M & 1W+2W+3W join NH to form two small triangles & set | all pull RSh back, 1c cast to 2pl opp side, others cast 1pl clw round each triangle ; repeat [9-12] from new places. 3M & 2W end facing down/up in centre, others face clw round their triangles

17–

3M+1W+3W & 2W+1M+2M Snake Pass{6} to opp side (M side: 2M,1M,2W; W side: 3M,1W,3W) | all set

25–

1c ½ diag R&L starting RH to 1cnr pos (3x,1x,2x) & face cclw ; chase ½ way cclw (2,1,3)

Longer instructions are at https://my.strathspey.org/u/murrough/ReuleauxRotor.pdf