Jeepers!
It just needs a cleaning and new soft parts
- all comes in the kit.
You can do it by rote (just put peices back in reverse of taking them apart) and set the adjustements per the instructions and not know how it all works, or you can read/watch to know what the parts do and how it works and then take it apart, clean it and puyt everything back in reverse. It doesn't matter a lot - you don't need to know how it works to rebuild one.
