I ride western with split reins either neck reining or direct reining when teaching your horse to spin on its hindquarters what is the proper most effective way to manuever your hands?

In my lessons, what my instructor told me was that he takes the reins, and if you are spinning to the left, you keep your hands the same distance apart and bring your right hand just to the left of the withers ( your hands should still be about 6 inches or so apart). If your horse walks forward, use the direct rein to hold him back, but don't pull his head around, as this prevents him from spinning correctly. When you want him to stop, just bring your hands back to the center.