I recently purchased a terrific Hsu sub and while it has enough stuff to rock the house, one problem I have is that it walks around the room. It came with screw-in plastic "spikes" that don't have enough purchase on the floor to anchor the thing down. In a loud movie (Iron Man comes to mind), when it's over, I have to relocate the sub back into its corner. Anybody know whether you can get aftermarket spikes that are an exact fit for a Hsu or whether you also need a pile of bricks to hold it down?