Electronics Repair Questions? Ask an Electronics Technician
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Do you mean that you broke the case that the wristband attaches to?
If so, the case must be replaced, yes.
That should be done by a professional-level (or, fairly high-level) jeweler or watch shop.
The pro-level jeweler should be able to tell you, if I cannot. And I have to admit that, after a search, I cannot find replacement case parts for the Garmin 210.