Rotary Grinding

Collet nut lost its threading after 5 minutes?
I bought a dremel-like rotary tool yesterday and used it for about 5 minutes. I was using a grinding stone against my computer case when the bit slipped out of the tool. Now I can’t attach it back in because the collet nut doesn’t seem to be able to be tightened back on. I think it lost its threading or something.
I’ve never had one of these tools, so I don’t know if I neglected to be careful somewhere while I was using it. What did I possibly do wrong? The brand of this tool is GreatNeck, are they known to make shoddy tools?
GreatNeck tools are excellent quality.
They will replace your rotary tool if you contact them.
http://greatnecktools.com/linki.php?link=customer_service
Blanchard 18-42 vert spindle rotary surface grinder, Ref.#47-151.wmv
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