The eccentric sleeve should enable you to find a good vertical meshing position with the reduced height central teeth on the clutch sprocket, not to close with teeth touching or you will get a horrible whine which you might think is emanating from somewhere else more serious, the eccentric sleeve, if adjusted correctly should also enable you to centralise the dynamo fairly central in the primary chaicase hole, you then adjust the dynamo sprocket laterally, it should be dead centre on the central row of the primary chain, you can then seal everything up with silicon, but you should be using an oil thrower to keep the oil on the inside of the chain case, and some people have found that an airtight chain case is undesirable, I am sure that all this is covered in KTB and Vincent by Paul Richardson, probably in more detail that I have put on here.