I took my engine up to Phil's last Friday for a full conversion as I previously had the Harley compensator, as per Chris's comments, everything was cleaned off, then trial fitted a number of times before final assembly. You would not believe the allowable tolerance and discrepancy in the machining of the crank shaft splines. Thankfully we (he) managed to get a pretty good interference fit between the crank and new hub assembly. This took quite a long time fettling the crank and trying different undersize hubs to get the best fit.
Unfortunately it will be well into next year before I can get the engine back in to try it but everything that can be done has been done. So fingers crossed.