hi Simon, the “HRS Xero-Play SC2 QR mount” has threaded holes I suppose right? since motor-side HRS qr hasn’t. and how long is in total? thanks 
The HRS SC2 QR mount is 55mm tall and yes threaded. It’s really easy to drill out the threads if you wanted to use a threaded QR system… it’s standard 70mm hole pattern so will work with any 70mm QR system, not just the Xero-play.
Here is a photo of one in red that I had a few made in as well as the black this time.
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