Depends when and how it was made.
A 604 won't come apart like that as in an alnico 604 the HF section has no back plate or "bottom" in it's pot so to speak, like you see in that 617 assembly.
604 HF section shares the "bottom" of the LF return pot.
It's been so long since i saw one gutted that i don't remember for sure. But, i think the HF is secured to the LF by means of 3 or 4 small screws from inside the LF pot just outside the diameter of it's magnet slug.
Sadly, i don't think a detailed cross section, or sectional view of a 604 exists. If somebody has one(or internal pics), please post.
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