Not the end of the world infact a fairly easy fix if you have any experience with timing belts and pulling out old seals.
I would recommend purchasing a whole timing belt kit that comes with front seal and camshaft seals.
If you don't have the money to purchase the entire kit simply buy the front main seal it requires if memory serves to have the timing belt removed and the crank shaft snout exposed, all can be done with the engine inside the car and radiator and ac cooler removed.
personally I put thread locker on my harmonic balancer too. If you have any question about the procedure I am happy to help
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1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.
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