Drill a 1/4-inch hole through the steel block 1 1/2 inches from the end of the long axis. Drill another 1/4-inch hole one inch closer to the center. Drill two matching holes at the other end of the block.
Drill two 1/4-inch holes one inch apart through each of the two straps.
Slide two 3 1/2-inch bolts through the holes on one of the straps. Slide a socket wrench bolt over one of the bolts.
Insert the ends of the 3 1/2-inch bolts extending from the strap into the two holes at one end of the block. The bolt with the socket wrench bolt on it should be on the inside. Place washers and nuts on 3 1/2-inch bolts on the underside of the block. Tighten the nuts with a wrench.
Repeat this process with the other strap at the other end of the block. Secure the picket twister to a table with a vice. It is now ready for use.