Got a link for technique used to do vertical rope lights inside a cabinet?

[GeneDavis]

Did not the estimable M. Rabbit do a vid?  I can recall seeing something like that, or was it the rye whiskey?

 

Anyhow, I'd like to light some mullion-door wall boxes, and need a way.

[JKEdmo]

3 hours ago, GeneDavis said:

Did not the estimable M. Rabbit do a vid? 

 

Is it this one?