Are you planning to use the new crown race with your old CK headset or just use the new MPart headset?
The crown race of the CK one is quite flat with only a little lip, I suspect that the M:Part headset will come with a more conventional one so best to use the headset it's designed for.
@GideonPARANOID started
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Are you planning to use the new crown race with your old CK headset or just use the new MPart headset?