oh! that´s must be very painful…
I will give you another advise…If youa re going to practice tricks like the ones this guy does (my teacher, by the way) you must put tape on the sides of your tennis shoes, mainly if you do these tricks witha big top, like spintastics trompo grande, or a Giulia Top, or another big top, and heavy top, of course, I give these advice in order to avoid you more pain…
http://www.youtube.com/watch?v=biQHaT7xm1g
Gustavo Castro uses a small and light top (but even with this kind of tops, the pain can appear too)
and the pain you feel in your feet is less than with heavy and big tops.
Broken nails, injurys in fingers, pain in knees, feet, and…
the most dangerous with the top, (I say this by personal experience) is to throw a very high trapecio…almost all the time, I use glassess to protect my eyes…one day, I sufferred a very big blow in my eye…so …one day one teacher say to me in university…all the learning is with pain…