[HomeBrew] MIL style knobs - Racal

[Vaclav Sal]

I am building an external DDS oscillator to be used with my Racal 6217 and
would like to have matching knobs on the box.
However, I have lost the name of the supplier of these knobs and I am unable
to find in on the Internet. I have seen these knobs associated  with
Raytheon name but cannot find anything on it either. Can anybody familiar
with this hardware help me  find the source for these? I am not just looking
to have matched equipment, I need some heavy duty concentric knobs and what
I have found on Internet looks too flimsy.
73 Vaclav AA7EJ