Before the front differential and gearbox top can be installed - the centre layshaft needs building, since there isn't enough 'give' in the belts to allow the installation these parts one at a time.
The lay shaft and spur gear assembly is fairly complex considering there is no slipper included. Indeed it actually looks like a slipper when assembled. Even with the larger belts and pulleys from the 501X Worlds Edition – which are included in the Durga, there is still a concern over running this car with anything approaching a ‘hot’ motor, without a slipper installed. The slipper would absorb shocks from running the car and landing from jumps - extending the life of the parts.
The kit spur gear is 91T in true 48dp, and shares the same design as the 96T included with the 501X, so it can be used with a slipper later on if you choose to upgrade the car.
The centre pulleys are the same 18T items used on the latest 501X Worlds Edition and should cope well with strain. No belt rollers are supplied with the Durga - these help to stop the belt skipping in extreme cases, and are available as an option part.
Given the construction of the the centre lay shaft, it seems like it would be a small leap for Tamiya to have included a basic slipper. You can't have everything for this sort of money however so Tamiya released a slipper as an option part at the same time as the Durga - I wasn't able to get this in time for the build.