I have the same experience with the conversion. Some of them do get problems with the splines for a not (yet) known reason.
Phil is doing his utmost best to find out why some run problem free and some others doesn’t.
At this moment it looks like that Phil’s Centa hub needs a much more tight fit on the crankshaft as the original Centa. That could be the reason he prefer fitting only done by himself.
When the splines problems are solved this conversion is almost a must on every M3W.
