The last step of this woodworking project before we begin playing is to cut the chain to the proper length and attach it to the key rings. This will act as a spacer between the boxes so that the distance between the boxes is consistently at twelve feet.
To get the proper length, hold the key ring at the apex of the u-bolt and measure the distance from the end board to the tip of the key ring. Add this distance to the same measurement on the opposite u-bolt/key ring, and subtract the combined distances from twelve feet. This will tell you exactly how long to cut the chain to have a twelve-foot distance between the boxes.
Cut the chain using a hack saw or bolt cutters, then attach one end to each key ring. Pull the boxes apart so that the chain is taut, and position the boxes in line with the chain.
At last, you're ready to learn how to play washers!
TIP: While you certainly could paint or stain the plywood top, as you'll see when you begin playing, the surface gets pretty dinged up. As such, the paint really wouldn't protect the plywood that much. You're better off playing until the top wears out, then replace it with another piece of plywood. The plywood top should last a couple of summers before you need to consider replacing it.