>- Is there a video on the net that shows how to use the homemade zapper?
Unless yours is just a battery and wires, you should not need to tap. If it has a 555 chip or CD4066 chip, then it does the tapping for you. Just hold on to the copper paddles which have been wrapped in a wet paper towel (preferrably wet with salt water). 7 minutes on (minimum), 20 minutes off, repeat 3 times minimum.