Edit an .STL file

I have the .STL file of a geometry and I want to add a small ball on already existing ball. please refer to the pictures for better understanding.

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You can use meshlab (http://meshlab.sourceforge.net/), it's a free software, to convert to DWG, so you can edit it. I did this several times to import STL into Solidworks. My logo (fuleco) was made this way.

 
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