Reddit reviews 1 dia., 1/4-20 thds., Oval/Tapered Plastic Knob w/Black Brass Insert (1 Each)
We found 2 Reddit comments about 1 dia., 1/4-20 thds., Oval/Tapered Plastic Knob w/Black Brass Insert (1 Each). Here are the top ones, ranked by their Reddit score.
I found this control knob on Amazon that works great.
https://www.amazon.com/thds-Tapered-Plastic-Black-Insert/dp/B002DGC426/ref=mp_s_a_1_1?keywords=kme+knob&qid=1556131213&s=gateway&sr=8-1
Search for "kme knob" on amazon.
​
That finds this for example:
​
https://www.amazon.com/thds-Tapered-Plastic-Black-Insert/dp/B002DGC426/ref=sr_1_1?keywords=kme+knob&qid=1557025108&s=gateway&sr=8-1
​
Unfortunately they want $9 to ship it, so not super cost effective, but the description has the thread info you'd need to source it locally.