mower

Hit a horse pasture today where there's very few big iron hits, other than horseshoes of course, and found this piece. It's 7-3/8" long and 3" wide at the 'ears'. Anyone come across this before??

Some friends/neighbors want me to MD their yards (though I am a newbie and haven't even MD'ed my own yard yet). One person asked how long after digging and restoring a plug of lawn grass will the plug (typically) be reattached firmly to the ground? Once summer gets going here, people mow every...