Don’t settle for drilling in metal only to get poorly threaded holes or broken bits.

There are several ways to repair stripped crankshaft harmonic balancer bolt-hole threads on a small-block Chevy.

The process isn’t so simple for resin prints, since they don’t generally soften with heat. Off course, you can also print the threads directly, screw a bolt into an un-threaded hole, or tap a ...

If you want a real threaded part you can print the thread, cut the thread with a tap or bolt, or use a threaded insert. [Stefan] ran some tests to see how each of those methods held up to real use.