First of all, thanks to you all who offer your advice and experience. I dug what I would consider a really "iffy" signal yesterday. I heard a very short and quiet silver signal, stopped, swept it again and had trouble picking it up. I then wiggled it and got it faint, but solid. I turned 90 and could not get it, in fact I got a null. I swept even slower and still got a null. I have been passing up signals like these for years because I always seemed to get iron. I'd check for 2 targets in all-metal, usually find that the signal moved a few inches and dismiss it as iron, because I'd dug bits of iron with these signals. I then started adjusting sens. by what I've learned from you lately. Noon to two was where I was running. I couldn't increase the return by increasing sens., so I thought I was using the sens. about right. With all that said, I dug a 1918 Merc. from about 5 to 6 inches. I'm hoping it was edged or had a minute amount of iron close to it for such a weak signal. I was hoping for a stronger signal from my Sov. Glad I dug though.