I bought an Elimag demagnetizer at the Houston regional. I'd like some information / tips on operating it. I plugged it in. Placed some tweezers on it Pushed the button The light blinked, the tweezers jumped, and it seems to have worked. The tweezers lost the magnetism they had. However, it took a couple of tries to demagnitize a screwdriver. What is the correct way to use the Elimag? The light does not stay on long, just flashes ever so quickly when the button is pushed. Is this the typical action of this device? Should the button be held down or just pushed once quickly? Thanks.