Here is another top with taper joint for replaceable tips.
In this case the tips are simple balls, with diameter 3/16";
balls of whatever material can be used, from inexpensive ones like those made of carbon steel or teflon, to more expensive like ruby balls. When a tip is weared, it is simply replaced, which is an easy task.
The top maintains a good balance, after a tip replacement, thanks to the characteristic precision of taper joints.
In any case, if perfect balance is wanted, it is possible to fine tune it, thanks to the screws in the flywheel, by which it is possible to shift slightly the position of the center of mass of the top, and to align it exactly with the tip. When this is done, the wobbling due to unbalance disappears completely.
In the following video I explain how to adjust the position of the screws: