Transparent knobs for Tubemeister

I thought it would be cool to have transparent knobs with easy-to-see black lines; this is what I found...

"Stove top" knobs at http://www.mojotone.com/amp-parts/Push-On-Knobs-for-Pedals-Other-Projects/ADA-Flanger-Clear-Push-On-Knob#.VAzJTfldU1I .

These knobs fit fine on the shaft, however, I had to trim the diameter of each knob with a Dremel to get it to fit all the way into the control panel holes. I took the original knob and traced a line around the new stove-top knob with a permanent marker, then trimmed the excess. Keep in mind, when I trimmed the knobs with a Dremel, it was less than a perfect look, but with the blue light, the knobs look great, as you can see in the photo.

I also found a plain round transparent knob at https://www.sparkfun.com/products/10597 .

These knobs fit perfect without any modifications. I used a black permanent marker to make a straight line on the knob.

I like the look of the stove-top knobs better than the plain round knobs...

See the photos... to show everyone the difference between the two knobs, I put one of the round knobs on the left. After the photo, I replaced the round knob with a stove-top so the whole panel matches.

That does look nice - if it didn't involve trimming I do that....