Step 29: On playa: Reassemble with plastic liner
Push the gusset carriage bolts through tray sides from the inside of the tray. Twist the bolts to align the square shanks with the square holes in the tray sides.
Use care not to damage the plastic sheet -- it has to hold water. Resist the urge to lay sharp tools on it. But if you do spring a leak, duct tape on dry well-cleaned plastic sheet produces a near-permanent patch.
Place the sheet in the tray floor, with a weight (beer cans, for instance) holding it down in each corner. Adjust the position so the sheet lies against the floor, the rim inside faces, and the rim tops. Don't worry yet about the sheet bunching up in the corners. If it overlaps the projecting carriage bolts, force the bolts to make holes in it.
Lay the bucket protector fabric on the floor and rim, as shown. Fasten the sheet and the fabric to the rim with four of the 1-1/2" plywood staples, in the positions shown in the picture. Hold each plywood square down firmly with one hand as you start screwing, to keep the sheet from twisting up around the screw.
Reinstall the power and idler masts, capturing the sheet edge under the masts and gussets.
Press a finger into one of the tray corners. With the other hand, grasp the corner of the sheet and pull upward and slightly inward. The sheet will form a fold in a straight line diagonally down to your finger. Pull the sheet corner diagonally outward and down over the outside corner of the rim. Screw a staple down over the corner. Repeat on the other three corners.