Custom Elite Airsoft has a video for those who want to go into the innards of their AEGs to do maintenance or repair work for the first time. This covers the version 2 gearbox which is the most common of them all... "Custom Elite Airsoft UK - Part 2 of the understanding your Airsoft V2 Gearbox. here we talk about putting the parts back in the right order and what each part does. I hope this video helps and if it does please hit that like and subscribe button for more videos."