Remove the spikes. Get nuts with the same thread as the spikes. Thread the nuts onto the spikes and run them snug tight against the spike. Reinstall the spikes back into the base of the speakers running the newly added nut/spike combo tight to the base of the speaker. Level the speakers by backing the spikes out of the speaker base. Once level, run the nut up to the base of the speaker and tighten the nut to the base of the speaker.
Good Luck,
Doug
Good Luck,
Doug