If you have to conduct maintenance tasks on your Gilera Nordwest then it is always a good idea to own a Workshop Manual to keep just for personal reference in the event that you want to know proven methods to take off a specific component much like the Drive Shaft and match it again efficiently.
Gilera Nordwest Workshop Manuals will give you particular diagnostic guidelines for your car therefore if something is faulty it will help you work out what the situation is and the best way to repair it. After that you can determine if you can do this on your own or in case the job is simply too big you can still book your Nordwest in with a suitable garage.
Gilera Nordwest manual