On Dec 6, 2019, at 3:11 PM, Tom Goddard <goddard@sonic.net> wrote:

                br = self.session.bond_rotations.new_rotation(pick.bond)
                br.moving_side = br.bond.other_atom(br.moving_side)  # Move the large side

Not sure why this was hard to find since it’s a documented arg of new_rotation, but just do this:

br = self.session.bond_rotations.new_rotation(pick_bond, move_smaller_side=False)

—Eric

Eric Pettersen
UCSF Computer Graphics Lab