I bought this for two reasons: the main reason was that I was missing a drive coupler to mount the flexible shaft and the coupler itself was over half the price of this rectangular adapter (not included free shipping at the moment writing this review). The second reason was that it is also an extremely useful piece of equipment for certain cutting/grinding operations (because it can improve either the ergonomics of holding the Dremel, or the visibility of the workpiece, or both). a point that is very close to my heart. The knocking off of a sprocket due to a mechanism to hold the tool in place when the bit is attached, requiring another tool to cut through the alignment hole - this would be much more serviceable with a built in knob (like the flexshaft or the Dremel tool itself). Speaking of which, do NOT use the button on your Dremel for this purpose as I understand this can destroy the inside of the adapter.
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