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One of my tungsten drills (0.7mm) broke, because my (((hand drill))) is garbage(bad concentricity),
using my hands to rotate such a piece of shit ads even more stress to it.
Do you have expierience with Dremel or Proxxon stuff + flexible shafts?
I heard collet chucks have better accuracy than drill chucks.
PS: I drilled thicc wood (2mm) no PE