I use a flat blade screwdriver that I filed the edges round to prevent gouging the coin. I probe gently until I touch the coin and then I rotate the screwdriver around until the hole is slightly larger. Then, I move the screwdriver either left or right until it drops off the coin. I then push the screwdriver deeper until it is under the coin and then I pop it up. Sometimes it comes out of the ground and if it does not come out, I stick my finger in and feel for the coin. You are right on the money so to speak about damaging the grasss lawns of parks and schools. If you have to dig deeper for a coin, learn to dig a three sided plug and use a drop cloth to catch all of the loose dirt that you remove. Most time when you leave a hinge on a plug, the grass will not die. I have known some oldtimers that can retrieve a coin from six plus inches with nothing more than a screwdriver. What ever method you use, get good at it and respect the property or we will all be looking for places to hunt. R.L.