Hyperdeck Studio Mini - replacement knob

The title says it all really. Does anyone know if it is possible to obtain a replacement knob for the control on the front panel of the (old style) HSM? I'm guessing it may be possible to source a generic replacement (if not a genuine spare part) if I knew the diameter etc of the spline. Could it be something like this?

https://uk.rs-online.com/web/p/potentio ... lsrc=aw.ds

You could always try Blackmagic support, they send me a bunch of replacements for the Ursa volume knobs
support-emea@blackmagicdesign.com