If you want to accomplish adjustments on your own TGB F 409 then it will always be a good plan to own a Workshop Manual to use as reference in case you need to know simple methods to remove a certain part much like the Clutch and match it again in the right way.
TGB F 409 Workshop Manuals will give certain diagnostic facts for the vehicle therefore if something is not working it can help you identify what the issue is and how to make it better. Then you are able to determine if this can be done yourself or in the event the job is simply too big it is possible to book your F 409 in to a suitable car garage.
TGB F 409 manual