3 speed sequential gearbo with automatic clutch

This is a 3 speed sequential gearbox with an automatic clutch. I build this a while ago for RC car, so I tweak it to manual verion (took out the PF motors, made the clutch lighter, opened the chassis so you can see the mechanism and added a gear shifter). It is made of a 2-way gear shifter, a clutch pusher, a clutch, a gear indexer and a 3 speed inline gearbox. It operates by pushing (or pulling) the gear shifter (green), witch rotates the yellow gears. Those opens the clutch by pushing...