Good for you for wanting to go beyond the bare minimum spin training for a sign off. I've seen too many CFI's get signed off by getting into an incipient spin, a rotation, stamp a rudder pedal and a sign off. Duh.
If you want some real spin training and 15 different ways from Sunday to get into a spin that you don't hear about - but one of your students will do to you one day, and more than a few ways of getting out of trouble - go see (member on here) Catherine Cavagnaro at the Ace Aerobatic School in TN. Tell her you are doing it for your CFI and she will go above and beyond to make sure you are well prepped in ways a student might try and get you. Her spin sign off os worth a lot more than many.
