-
Do the knock-offs go by a certain name that I could search for?
They pop up if you search any platform for Hirame. They're not as cheap as they used to be, but there's a super cheap option now which is available from most bike shops or off of Amazon
https://www.freewheel.co.uk/truflo-track-mate-high-pressure-track-pump-head-qa4900If I didn't already have a proper Hirame Yoko, I'd get a KCNC, apparently it's actually better and definitely more #tartmode
https://clee-cycles.co.uk/P36505/product
If you want a genuine one, probably Alex Cycles in Japan or Ben's Cycles in the US. The knock-offs work OK, Varno had them as did user Tekno on timetriallingforum.co.uk, probably others too. The KCNC one is nice but needs a slightly taller hole in your disc wheel if that's a concern