The Kobuki base by itself doesn't drift, so it is sensible which the tilted inertia causes the drift. Not surprisingly I am able to hack my URDF that has a weightless superstructure, but I needed to repair this in a far more sensible way. I tried all I'm able to https://www.uk-exhibitionstands.co.uk/product-category/pop-ups-and-banner-stands/pop-up-stand/