I now have 4 MP10's and they don't hold firmly to my new cube (1/2" Glass). They work great and are freshly cleaned but I need one with a stouter magnet. They are older ones with the white controller MP10W. Would like to trade 2 for 1 or I suppose I could sell them for $165 each and buy a MP40. No shipping at this time, I may consider it if I have no luck locally.