I used my ATPro today first time out. Question, when pinpointing with the coil, I have been going r/l and back & forth where is the sweet spot on the coil? Seems I was digging some bigger holes to find stuff. Is it right at the apex about where the shaft connects? My son and I got a Wheatie, a merc dime and a lot of junk. I had to explain to my 11 year old what a pull-tab is. Man did we have fun, now he wants one, looks like he'll be getting a 250 or 350 after a few more outings to ensure he got the bug. He was a dirt diving fool today. Thanks for your comments, I love my machine.