If you have to execute maintenance tasks on your Triumph Thruxton then it is usually recommended to own a Workshop Manual to keep just for personal reference in case you want to know the way to strip off a specific part for example Drive Shaft and install it again properly.
Triumph Thruxton Workshop Manuals provide you with unique diagnostic facts for your automobile so if something is playing up it can help you ascertain what the problem is and some ways to make it better. You will be able to decide if this can be done yourself or in case the job is too big you are able to book your Thruxton in to a nearby repair garage.
Triumph Thruxton manual