Reddit reviews 300 Series Stainless Steel Thumb Screw, Plain Finish, Knurled Head, Oversized Head, 1" Length, Fully Threaded, 1/4"-20 UNC Threads, Made in US
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Panel screw for easy attachment to panel assemblies, staying in place even when not tightenedExtra large head with straight knurl provides additional grip for manual adjustingStainless steel 300 for corrosion resistanceOne-piece construction for strength
Have you contacted Zhiyun support?
Otherwise, you could try picking up a 1/4"-20 thumb screw from Amazon.
https://www.amazon.com/dp/B005RTFGBC/ref=biss_dp_t_asn
https://www.amazon.com/uxcell-Aluminum-Shoulder-Knurled-Screws/dp/B01N6AGR0H/ref=sr_1_7?ie=UTF8&qid=1521944751&sr=8-7&keywords=1%2F4%22++thumbscrew
https://www.amazon.com/SmallRig-Quick-Release-Female-Thread/dp/B00CBSL30K/ref=sr_1_20?ie=UTF8&qid=1521944776&sr=8-20&keywords=1%2F4%22++thumbscrew