Seeing this old thread, did anyone consider LOCKING casters? I had some I was going to put on Wharfedales then life intervened. The idea of the casters was so when nobody was home I could move the L/R farther apart into what would be the traffic pattern if people were home. And also because Wharfedale had a totally STUPID system, spikes but then instead of rounded thread-in substitute feet they had metal pucks for the spikes to go onto, except if you tried to move the speakers the spikes would pop out of there and scratch the floor if you were unaware. D'oh!