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Insert each carriage bolt until the square head of the bolt engages the square hole in the metal. Rotate the front base (2) and the rear base (4) so that the head of the carriage bolt is on the bottom. 2. Attach the main frame (1) to the front base (2) and the rear base (4). Position the main frame (1) onto the carriage bolts (22) which protruding through the front base (2) and the rear base (4). Secure the carriage bolts with four washers (18) and four nuts (20). Tighten the bolts securely. 3