trying to reinstall an SFI harmonic balancer on a Ford 302 engine where i needed to replace the timing chain and other stuff. pulling it was easy with the puller but i lightly tried to use the crank bolt to drive it back in and it is chewing up the threads on the crank bolt so i stopped and we picked up a new bolt and i will chase the threads in the morning. i was using my Ingersol impact gun to drive it in, can this be why the threads were starting to screw up? this is a standard balancer with a keyway slot. is there a special tool i need because my local Napa rents tools and they said they never saw a balancer installer ever.