Lighted Knobs...How?

[redrabbit]

I've acquired a bunch of knobs that, when backlit, the "pointer/indicator line" will light up. The backsides are clear plastic (resin?). They are just over 1 inch wide, for a 1/4" shaft.

So how is this done? Are there ready-made LED fixtures ? ...or must I futz with it on my own?

=RR=

 

[Apex Jr]

As I recall the mil-spec lighted knobs were illuminated
from a blackend plastic panel with parts left white so a
light say a small 327 lamp 24V could be put into the plastic
in certian spots to illuminate both the panel and the knob.
Steve @ Apex Jr.

 

[vixr]

there is a device called a "light pipe" that is also used... optic fibers routed to a remote LED that carries the light thru the tiny fibers, to the knob

 

[cpemma]

One system using acrylic rod for the knobs - Final result and How-to

And another method with these aluminium knobs from the same guy.