If you want to undertake repairs for your TGB 303R 150 then it is usually a great idea to own a Workshop Manual for personal reference if you want to know techniques to take off a particular part much like the Drive Shaft and match it again correctly.
TGB 303R 150 Workshop Manuals will give you special diagnostic info for the car or truck so if something is playing up it helps you figure out what the issue is and easy methods to fix it. You will be able to analyse if you can do this on your own or in the event the job is too big you can actually make a booking for your 303R 150 in to a suitable repair garage.
TGB 303R 150 manual