Hey DP,
You have to use the small saucers they sent you with the spikes. You have to put the spike on with somebody holding the speaker off the ground and slide the saucer under it. There aren't any rubber spikes for the towers. It ended up being such a pain that I just set my 6T's on the floor. :)
Jason
Speakers: Aperion 6T's, 6C, 4B's, and 8D
Receivers: Onkyo 805 and Pioneer SX-1050
DVD player: Oppo 981HD
TT: Pioneer PL-71
Amp Selector: Niles DPS-1