Hi Tony. Its a Suzuki TS185 clutch bought from good old fleabay. The Suzuki one comes riveted to its primary drive gear with an integral cush drive. We have had to dispense with that and reduce the size of the cush drive lugs on the back of the basket. Some machining (thinning!) has had to be done on on the back of the Suzuki centre hub too. The original thrust washer from the back of the Ariel centre has been ground thinner and is now located on the back of the new basket trapped between that and the Ariel sprocket, redrilled to suit, re-riveted and held in place by the new hub which is secured hard against the original unmodified centre bearing carrier, held at the required clearance by a custom made bush. We needed to make it as slim as possible so that the primary case will fit unmodified hence a bit more machining than if a different or modified case was being used. We also had to make a new new pressure plate thrust bearing carrier as the Suzuki one is pulled on a tiny rack and pinion arrangement . Ours pushes as the original. The Suzuki centre hub was converted to fit the Ariel mainshaft by 'spark eroding ' the centre to suit. It sounds a bit complicated but its not so bad as there was quite a lot of 'suck it and see' going on. Most of it could be done on a decent lathe and milling machine. The thrust washer was reduced on our surface grinder. The centre we could do for you on our spark eroder as the hardest bit is making the electrode, which we now have. Incidently we can put the same spline down the centre of any ferous obect with it, i.e. gear conversions..