Broken Flex Again! - Replacing Spring Arm

We replace again a flex spring successfully on this acetate frame!
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[@sajeevnp6090]

Can you bring the details of that machine, like a portable hand driller

[@SpecsRepairs]

It's called "flex shaft rotary tool". It's not a small machine, on video you see only the handle! If you want a good one you can look at the "foredom"