There is a spring and some sort of latch You can see it off to the side in this post https://www.reddit.com/r/Trackballs/comments/u0f9kn/smooth_scrolling_in_mx

There is a spring and some sort of latch You can see it off to the side in this post https://www.reddit.com/r/Trackballs/comments/u0f9kn/smooth_scrolling_in_mx_ergo_mod_description_in/ https://www.reddit.com/r/Trackballs/comments/u0f9kn/smooth_s... But know that it won't make the onscreen scroll smooth. Only the physical feel