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If it has, please fit it into the hexagonal hole in the retainer so that the rounded side of the lock nut faces out. 6 Shown Actual Size • Fit a retainer with lock nut onto the end of the screw and to the inside of a side rail. • Tighten the screw with a Phillips screwdriver.Do not over-tighten. • Repeat this procedure to fasten the screw in the other end of the front tube and side rail, using the remaining retainer with lock nut. Rounded Side M4 Lock Nut - 2 (Inside Retainer) Retainer with Lock