left-side starter back-lead free spin

Start in a starter position.
On 1, is to lead the follower towards 6 o’clock using a flat right hand.
On 1.5 lead the follower towards 7 o’clock with the palm of your right hand, which is the equivalent of the left prep.
On 3 flex your wrist to lead the follower towards 5 o’clock. The right hand will disconnect from the shoulder blade on 3 and the follower will enter into a free spin.
End in an open left or open righty position.

Typically for an free spin, you would use your right hand to lead a left prep on 1.5 and lead the follower into the turn. In this case you are doing the same prep with the same hand and on the same beats, but from a starter position.