eBay unit arrived today. At first glance the construction is impressive and the lower, larger diameter end of the element fits perfectly into the carbon steerer tube of my Diverge. With a bit of carbon paste, the revised collar torque spec of 4nm won't be an issue at all.

The top cap bolt seemed to be cemented in place upon arrival and when I tried unscrewing it with the appropriate hex key I rather quickly stripped the soft aluminum head of the m6 bolt. Fortunately, there was enough space for my hack saw to cut it in half so as to remove the included carbon cap.

I may end up cutting down the plug a bit (and inserting a star nut) once I sort out the stem and spacer combo I'll be using.