I was recently going to put my big muff on my pedal board... So I was going to take its "feet" off the box. Three of them went off with no problems, but the fourth couldn't be unscrewed. So I opened the box, and then realized why... there was a blue wire attached to it. I suppose this is some kind of grounding, or similar. I guess I shouldn't mess with this. But I'd really like to take all four knobs off, so I can put welcro on it. Any suggestions? Can this wire be removed?