Yes, the ball now rests on tiny cheap bearings of a material that doesn't look like metal to me, not sure what it is exactly. You don't lose accuracy as the bearing fail/lose their lines/get cruddy. So you cannot replace the ball with just anything that fits in the hole Although the overall construction of the newer model is definitely cheaper feeling, in practice the new design seems more durable. The new model is more of a true optical system, the ball itself is sparkly and there is a single sensor area in the bottom that reads the sparkles somehow to register movement. You could clean them (had to regularly) but eventually the casing would get loose, and the body screws were only meant to come in and out of the plastic so many times, etc. This gunk would eventually get in between the bearing's painted surface and the optical reader, making movement erratic. Although the bearings were made from metal, the lines on them would scratch/wear somehow off over time, the ball would wear a grove in the middle of them, and the bearings would get all kinds of hair and strange things caught up in and wound around them. This made the ball easy to replace with other round things of approximate size, 8 balls from certain gauges of pool tables worked reasonably well. The older Turbo mouse was sort of quasi-optical, the ball's turning made the donut shaped bearings it rested on (one for H and one for V) turn, and these had black lines painted on them which an optical sensor picked up. I think you will have little luck combining these two, they have very different mechanics.
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