We have a Max planetary gearbox, a NEO 550, and a MAXPlanetary 550 Input kit. We can’t figure out how these fit together. There’s no useful info at the web page about the input kit: MAXPlanetary 550 Input Kit - REV Robotics
There’s nothing much on the documentation about assembling the gearbox for a NEO 550 except for this: https://docs.revrobotics.com/maxplanetary-system/maxplanetary-gearbox/features#input-features
But we can’t figure out if the input kit goes on the NEO 550 first and then the universal input stage, or vice versa. We can’t figure out the purpose of the input kit either because it has the same holes as the universal stage.
Here’s an image of the NEO 550, the universal stage (bottom left), input kit (to the right)