One last thing - the laminate on the iron - is that any insulating material? Does the laminate work well, or is spinning the disk a better option? It seems to me that keeping that disk stationary makes the design simpler, if I didn't have to worry about eddy currents. I just don't understand how laminating the iron prevents eddy currents. I see you call it a "high grade laminated iron backing", and high grade usually means expensive.