Get refractory cement from a great guy, Darren Ellis. I use AGP#36, many use Satanite. He also has soft firebricks if you need more. http://refractory.elliscustomknifeworks.com/ I just bought a little round magnet that had a hole in the center and screwed it to the end of a 1x2, which I clamped to the table near the forge. I check the whole edge from tip to plunge cut to see if I'm heating it evenly - sometimes most of the blade is non-magnetic but the tip or somewhere else is still magnetic. Type of magnet shouldn't matter. Have fun!