1)
What was the "Neizer ha'Kodesh"(the holy crown)?
1.
Rashi, Rashbam and Targum Yonasan: The Tzitz (on which the holy Name of Hashem was engraved).
2)
What does the Torah mean when it writes "Venasata es Neizer ha'Kodesh al ha'Mitznafes"?
1.
Rashi: It refers to the middle thread which ran over the Mitznefes, which, together with the two side-threads that tied with it at the back, formed a sort of hat. 1
2.
Ramban: Refer to 28:37:2:2.
3)
Where did the Kohen Gadol wear his Tefilin?
1.
Zevachim, 19a: Hair was visible between the Tzitz and the Mitznefes, which is where he wore his Tefilin. 1
1
See Torah Temimah, note 10 and refer to 28:37:2:2*.