So, I finally add these lines in LGEO.xml :
And for now, it works fine. I'll let you know if something goes wrong.
Code:
<Element>
<LDrawFilename>stud2.dat</LDrawFilename>
<POVName>lg_tech_knob_logo</POVName>
<POVName Alternate="Clear">lg_tech_knob_clear_logo</POVName>
<Dependency>LGDefs</Dependency>
<MatrixRef>LGEOTransform</MatrixRef>
</Element>
<Element>
<LDrawFilename>stud2a.dat</LDrawFilename>
<POVName>lg_tech_knob</POVName>
<POVName Alternate="Clear">lg_tech_knob_clear</POVName>
<Dependency>LGDefs</Dependency>
<MatrixRef>LGEOTransform</MatrixRef>
</Element>
And for now, it works fine. I'll let you know if something goes wrong.