What is a Flexible Shaft?

Standard Flexible Shaft Assemblies - SS White

Flexible Shafts - Nur Pres Flexible Shafts Handpieces Motor Hanger

DREMEL® Flexible Shaft Attachments to Reach

Professional Measure Tool Drive Torque Angle Gauge 360° Adjustable

Flexible Shaft, Dry Tube Cleaning, Heat Resistant Steel Casing for Tube I.D. 1 and up, Flexible Shafts & Accessories

Series AX - Flexible Shaft Concrete Vibrators

Flex Shaft Casing

Flexible Shaft, Wet Tube Cleaning, Nylon Casing for Tube I.D. 1/4-3/8, Flexible Shafts & Accessories

Flexible Shaft, Dry Tube Cleaning, Super Heat Resistant Steel Casing for Tube I.D. 1 and up, Flexible Shafts & Accessories

Dremel 225-02 (2.615.022.5AJ) Flexible Shaft Attachment

Cheap Flex Shaft Grinder Carver Rotary Tools Hanging Electric

K.8301-307 Flex Shaft with Jump Ringer Kit

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 screw thread to fix it like a Dremel shaft does. How do I avoid the twists? Do I need some extra part?

Intro to the Flex Shaft: What Can It Do For You? Cut, Carve, Polish, Grind, Jewelry

Grobet Flex Shaft Kit C-300 1/10 HP 110v Rotary Tool with Hand