First make sure your the cue ball will bounce predictably off of your tray. Some trays have an edge that stick out and the cue ball doesn't bounce well off of it. Also make sure the side you're using isn't cracked. Place the tray, filled with all of the other balls against the long rail with one edge at the first diamond. Put one of the object balls on a piece of chalk along the end rail, making sure that none of the ball is hanging over the edge of the rail.
I start with the cue ball two diamonds away from the end rail and one diamond out from the side. Find an aim point on the far rail and keep your hit constant. Either adjust the aim point so the cue ball hits the object ball correctly, or adjust the chalk and object ball into the cue balls path, making sure it'll still get to the pocket.
Here's a variation of a shot I first saw Bogdan "The Wizard" Wolkowski do. The Wizard's version had three balls on a pieces of chalk for a nice chain reaction as one ball would knock off the next one.
2006 - 2017 © Tim Chin