After getting use to the cz-5 with the stock 8" coil and having great success, I decided to buy the little 5" coil for the (trashier) places I hunt. I swear I think I did better with the 8" coil in the trash ?? With the stock coil I could identify a rusty nail or trash 90% of the time by swinging one way then 90degrees the other direction and see if the tone changed. This new little coil will tone good from both directions as if its a coin, espeicaly if it a faint deep tone and its almost always iron. I know the cz-5 likes iron but is there a different technique for the small coil ? Thanks.