Plastic Frisbee, Put a hole in side to tie to clip with string... Glue a Magnet / s from an Old Comp. Harddrive in bottom. They are Strong. put soil / sand in. If any metal the Magnet / s will cath. Then dump back in Hole! I usually cut around Top plug of grass before digging. flip over, then flip Back. Con'Gratz on the il one! A couple of Finds and Hooked they'll Be!