I had printed a copy of a chat from 7/30/00, so I looked up the address for you. There are detailed explanations of a few excellent methods of filling speaker stands. Hope this link works, otherwise try searching for a thread titled "sand or shot for speaker stands?
http://www.audiogon.com/cgi-bin/forum.pl?asund&960562052&read&3&4&
http://www.audiogon.com/cgi-bin/forum.pl?asund&960562052&read&3&4&