Probably the plastic housing holding the frontmost ballbearing in the unit
is loose. Open it up and seat the bearing in some epoxy. These tools (even
Dremel, the Mercedes of rotary tools ) are basically shit as far as
construction is concerned.
The dremel will be just as bad. I think jewelers and the like buy much
better equipment of this type. I have an "industrial strength" dremel tool
with a flex shaft that is extremely tough, but basically less convenient to
use than the unit without flex shaft.
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