Agamemnon\'s Helmet

[Dan Howard]

I am thinking of doing a reconstruction of Agamemnon's helmet as described in the Iliad. I was hoping that someone could check my translation:

κρατὶ δ' ἐπ' ἀμφίφαλον κυνέην θέτο τετραφάληρον
ἵππουριν: δεινὸν δὲ λόφος καθύπερθεν ἔνευεν. [11.41-42]

Lattimore translated the above as:
"Upon his head he set the helmet, two-horned, four-sheeted,
with the horse-hair crest, and the plumes nodded terribly above it."

Butler's translation:
"On his head Agamemnon set a helmet, with a peak before and behind, and four plumes of horse-hair that nodded menacingly above it."

There are two ambiguous terms in the first line: amphiphalos and tetraphaleros
amphi means "on either side"; phalos is some kind of projection - horn, crest, etc.
tetra means "four"; phaleros I'm not sure about. It could mean "horn" or "crest" but it could also be from phalara which means "boss". Liddell and Scott reckon that it means "four-bosses" and that the word is the same as the latin phalerae.

So it could have two crests and four horns or it could have two horns and four bosses.

The second line:
hippouris is "horse tail"
lophos is "plume" or "crest"
deinos "terrible" or "fearful"
kathuperthe is "down from above"
neuo is "nod" or "beckon"

The words "horse tail" and "crest" are both singular so I'm thinking that the helmet only has one of these. The most likely interpretation would therefore be one horse tail crest, two horns, and four bosses. So my translation would be something like:

"Upon his head he placed his two-horned, four-bossed helmet
The horse tail crest nodded menacingly down from above."

How did I do?
Is Agamemnon's helmet mentioned anywhere else in the book?