Machina dynamica is once again setting the standard of snake-oil tweaks to a new low:
http://cgi.audiogon.com/cgi-bin/auc.pl?accstwek&1151032327&1150948827
If they are that concerned about the magnetic influence of a wall plate, then shouldn't the screw to hold the plate onto the fixture be made of nylon? I'm surprised they're not making them out of carbon fiber and charging $75.00/plate.