Not sure if anyone from SRM reads these threads, but if 2 systems have gone awol they should be told, given they are pretty serious about quality. I thought it was down to me or my taper, but likely not. And I woudn't use Loctite on the thing - why should we? Make it even harder to get off. Whatever, if someone made a system which came with a pulley pre-machined to take the unriveted centre section of the original sprocket (not hard to do for a professional shop, bit fiddly for an amateur as I discovered), drilled and tapped for a basic extractor to be applied, plus supplied a dynamo pulley that would fit through the 'ole (it would be easier to do up off the bike, although still not the simplest), life would be a lot easier!! Hawker have achieved the latter by the sound of it. A secondary problem I encountered with the SRM kit was that the side plates on the drive pulley - which stop the belt sliding off the thing - were oversize on mine. I had to pop the outer plate off and turn the outer diameter down 60 thou so that the timing case would go on. I can't remember an original sprocket ever coming off either - although I do remember them being darn hard to extract sometimes. If I'd taken a pic of the mod I've done, I'd post it . . . next time . .