HELP - Dismantling older Dremel flex shaft tool

Hello, I have an older style Dremel flex shaft tool (model 255-T2) as per the stock pictures. The issue is that the flex shaft "core"

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I bought this flex shaft to use with my electric drill (kinda like img 2) but when it touches my work the shaft gets all twisted. The part indicated doesn't have a

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Polish, sand, grind, cut, drill, remove burrs and shape with precision with the WEN Rotary Tool Kit with Flex Shaft. This kit comes with 80 accessories conveniently stored in a case. The rotary tool offers variable speeds of 8000 to 30,000 RPM to fit your various projects.

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