Broaching or ?

[Dell]

Hi all
Is there anyone on this forum that could cut a 11mm hexagonal hole in a piece of mild steel rod either by broaching or other method ?
The rod is small enough to post approximately 6” and anyone willing and able to do it if they could PM me.
Bellow a picture of what is to fit in it ,although the hole needs to be approximately 3” deep the hex only needs to be 1/2 to 5/8” deep.
Thanks in advance Dell