1. not sure
2. not related, but it's the best to do so. a FUSE is used to break the electric circuit when the current is too high to prevent overheat or damages to any parts of the system. if the fuse is absent but a large current is running through the circuit, it usually brings with the overheat of motor when concerned with an AEG.
3. if what you mean by 模型電 is the same of mine, then it's ok.
4. I don't quite understand your question, sorry.
5. i believe what you mean by that is the insertion of thin rings to the gear shaft. this is to fill up the spaces between the gears and the gearbox innerface. if you;ve got yourself a bad gearbox with bad gears without the correct settings of the rings, the gears would normally break down when used for a while.
6. not sure
7. get outside and take a look lol
