I say secret just because they are not listed in the knob section
at least on my end !
www.taydaelectronics.com
They look like great candidates for those 6 knobs 125b projects ^^

Knurled Aluminum Black Knob 13x15mm
OMTER TYXN - Get It Fast - Same Day Shipping
They look like great candidates for those 6 knobs 125b projects ^^