Did the Greeks ever adopt foreign equipment ..

[Sean Manning]

What is your evidence that Greeks invented the tube-and-yoke? Very early on we see it from Fars to Gaul, from Scythia to Cyrene.

All areas that the Greeks either colonised or visited - not that I am agreeing or disagreeing with your point BTW :-)

And therefore all places from which they could have borrowed that cut or been influenced by it. Similarly, almost all 6th century art showing detailed pictures of men in armour is Greek, so we would expect to see it first in Greek art whether it was a Greek fashion or a foreign fashion which the Greeks adopted (like the Scythian bow). I can't recall any scholar who has looked at this cut and tried to determine its origin.