If you wish to do maintenance tasks on your own Diamo Velux then it is usually a good idea to possess a Workshop Manual for reference if perhaps you need to know techniques to strip off a particular component for example, the Clutch and install it again in the correct manner.
Diamo Velux Workshop Manuals offers clear certain diagnostic info for the vehicle therefore if something is wrong it will help you figure out what the situation is and methods to correct it. After that you can determine if you can do this on your own or in case the job is simply too big you are able to book your Velux in to a local mechanic.
Diamo Velux manual