Remove the cylinder, piston, tappet plate, and air nozzle assembly by lifting it up. Be careful not to lose the tappet plate spring when you do this.
Note that each gear may have one or more shims on them. Keep each shim in its original position and be careful not to mix up or lose any while removing the gears. Each gearbox has a unique shim configuration.
After the gears are out of the way, carefully pick up the anti-reversal latch and do not lose the small spring that is attached to it.