Kurcharsk
I use a hard flat rubber over the u-shaped to avoid any contact with the loudspeaker's base paint.
Pay attention to use the flat jack in the center of the smallest side of the loudspeaker (not too far from the edge). First, lift the front side. So, you can replace the two front casters with spikes. remove the jack and do the same at the rear side.
Do not lift the loudspeaker too much. If you have someone to help you, it will be better to avoid an accident.
Bests, Luiz Falcao
