TWE Boost Hub

Does anyone know what type of hubs TWE use for their own branded hubs?

I have bought a wheelset second hand and need to change the freehub from XD driver to Shimano and for the life of me I don't know how to remove the XD driver. The 2 end caps appear to be threaded on, I can get non drive side end cap off but cannot remove drive side. There is no slot to hold on the axle on non drive side or anywhere for allen key.

Greg from TWE is away at the moment so can't ask him directly either. Any help appreciated.
 
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