If you have to do fixes on your Derbi Senda Baja 125 4T then it is always recommended to possess a Workshop Manual to keep just for a reference if you want to know proven methods to take off a specific component such as the Drive Shaft and match it again effectively.
Derbi Senda Baja 125 4T Workshop Manuals provides exact diagnostic guidelines with regards to your automobile so if something is faulty it can help you ascertain what the issue is and how to resolve it. You can then evaluate if this can be done on your own or if the job is too big you can book your Senda Baja 125 4T in with a trusted garage.
Derbi Senda Baja 125 4T manual