This trick is meant for backside so ride with the box to your back. Ride about a half of a board length away from the box and at no more than a 45 degree angle. You might wan't to put your front foot a little closer to the hardware bolts. Ollie up and turn so that when you land your board will look like a Noseslide and a Nosegrind. Be sure to land on the truck first, then let the nose touch down. When you are about to get your front truck on you will have to kick your foot toward the edge and put pressure down. Make sure your body is toward the end of the board and that the nose is touching the box. Hold that position to slide. You kinda have to relax to do this. It takes a long time to learn how to grind these bitches. The only tip I have on comming off is to ride fast and grind the box pretty far, then hope that you come off. Just kinda kick your front foot off and away from the box and pull your back leg in so that you are turned straight again. Feel free to e-mail me if you have any questions with this trick. I might not be able to help that much cause I suck at it too.