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Go buy some 7/16x20 all thread rod should cost you about $8-10. Then buy 3 @ 7/17x20 nuts and buy one large 7/16 flange washer.

Total bill for this should be around $12-15 TOPS. The all thread rod will come in a 3 foot piece but all you'll need is about 1.5 feet if not less (varies with trucks). Thread 2 nuts onto the end and lock them together and then thread the washer and nut down so it seats against the harmonic balancer.

Then simply use a 2 big wrenches and wrench it on. The large washer will seat flat against the harmonic balancer.