Posted:just from looking on google (if you haven't done that already, apologies if you have):
Here's their email from their website, it's a German one but I'm sure someone there will help you out in English:
"For more infos simply drop us a line by eMail: info(at)aja.de (juggling) or webmaster(at)aja.de (webservice)", website is www.aja.de
you'll get better hits if you look for "advanced juggling articles"
these places sell them in the uk:
"vices are like genitals - most are ugly to behold, and yet we find that our own are dear to us."
Owner of Dragosani's left half