Hi Ashwin, welcome to Salsa Forums
I'm assuming you are talking on1 (when dancing on2, the follower spins over the 1-2-3).
In slot-based salsa styles, you tend to structure moves where you have the setup measure (where the leader sets up a move) and the execution measure (where the follower executes the move/turn). In on1, 1-2-3 is the setup and 5-6-7 is the execution. On2, you set up over the 5-6-7 and execute over the 1-2-3 (or should it be 6-7-1 / 2-3-5? I need to think about this...). However, this timing is
not necessarily followed in spins. Spins are rule breakers, and that's why you need to prep the follower - in order to get the follower to break away from the basic step.
There are several points you need to bear in mind when spinning the follower:
- Right (clockwise) spins are executed on the right foot; left (counter-clockwise) spins are executed on the left foot
- The follower's weight need to be on the foot on which she's going to pivot
- The follower needs to know that she's expected to spin (i.e., the leader needs to prep the follower)
- The follower needs be allowed to take a back break at the end of the spin
As long as these conditions are met, you can spin the follower on different beats.
In a single right turn, the follower turns on the 6 - the 5 is a step forward on the left foot. Pivoting is done on the 6 when the weight is on the right foot. This is done using the basic step timing, so minimal prep is required.
In a double right spin, the leader gives the follower a prep so she doesn't shift her weight to the left foot on the 5. This allows him to spin her on the 5 and 7.
You can squeeze more spins by either turning her faster over the 5-6-7, or starting the spins earlier. If you prep her over the 1-2, she can start spinning from the 3. If the conditions are optimal (good floor + spinny follower + perfect prep from the leader), you can probably get 5-6 spins over the 3-4-5-6-7-8.
You mentioned the wrap turn. In this move, the follower's turn over the 5-6-7 acts as a spin prep, so she can start spinning from the 1 (or even 8 if your prep is clear, but it usually feels a bit too hurried).
All these are about right spins, but there's no reason why you couldn't spin the follower to the left (except the fact that most followers are so used to spinning to the right, left spins often catch them by surprise I know guys who like to give a "right spins, check-prep, left spins" sequence, and I'm rubbish at following the left spins part

).