The OEM knobs are not the best, for it is more opaque plastic.
But the guy - describes this as a method of a small plastic "ring" with a groove(?) that the plastic flows into and towards the top. He does this stuff for DJ's and sounds boards, but the "ring" is at the base, with a "fiber optic" (which he may have meant ) a " hot Drill bit approach" of softening plastic; to make the hole not as a drill, but as a means to remove material to make the hole. for the filler to reach.
He says it's a technique used in the older Stereos like Marantz and Sony which had illuminated fiber optic tip to the top of the knob , but the "Ring" was a simple LED directed into the ring at the base the plastic although when done at the Factory, it was an insert, he says that's pretty much what is done you remove the knob "setting" (refers to the keyway and any knurling - make an opening and install a sleeve that fills in the shaft to knob gap and he lets it set .with the knob back in position. He uses some kind of 0.040" diameter fiber glass clear rod that then presses into the hole to meet the clear sleeve ring combo under it..
But the guy - describes this as a method of a small plastic "ring" with a groove(?) that the plastic flows into and towards the top. He does this stuff for DJ's and sounds boards, but the "ring" is at the base, with a "fiber optic" (which he may have meant ) a " hot Drill bit approach" of softening plastic; to make the hole not as a drill, but as a means to remove material to make the hole. for the filler to reach.
He says it's a technique used in the older Stereos like Marantz and Sony which had illuminated fiber optic tip to the top of the knob , but the "Ring" was a simple LED directed into the ring at the base the plastic although when done at the Factory, it was an insert, he says that's pretty much what is done you remove the knob "setting" (refers to the keyway and any knurling - make an opening and install a sleeve that fills in the shaft to knob gap and he lets it set .with the knob back in position. He uses some kind of 0.040" diameter fiber glass clear rod that then presses into the hole to meet the clear sleeve ring combo under it..
...runna pile-up on 6m SSB