If you have to perform fixes for your Sym RV1 then it will always be recommended to have a Workshop Manual to keep just for a reference just in case you want to know proven methods to take out a certain component for example the Drive Shaft and match it again adequately.
Sym RV1 Workshop Manuals will give precise diagnostic info with regards to your car or truck so if something is broken it will help you understand what the issue is and some ways to make it better. You can then decide if this can be done by yourself or if the job is too big you can still book your RV1 in with a local friendly mechanic.
Sym RV1 manual