If for whatever reason you don't want to buy a new nub and you feel that the nub is kinda loose (eg. you need to put too much pressure to move the pointer or you need to crank up to eleven the software sensitivity), one quick fix is to pad the hole of the nub with anything that makes the hole tighter and able to better grip the stick.
In the picture, I'm using a paper adhesive tape (which is easily removable) with the glue part towards the hole. Also, for obvious reasons, I highly recommend NEVER using anything permanent like glue or green stuff (use green stuff to manufacture your own diy nub if you feel courageous enough to do that)
I needed only two layer, but you will need to tweak around how many layers fits your use.
Now the hole is tighter and I can use the nub with 2.5 software sensitivity (on linux).
To insert the adhesive tape, cut a somewhat big square (area a bit larger than the nub) and, using the point of a mechanical pencil/needle or anything similar, gently push the tape inside the nub's hole and fix it to the "walls".
then put the nub back on the stick and see how it works.
after doing this "arts project", cut the excess of tape that can be seen once the nub is back to the trackpoint.
Thats it.
a good "gambiarra" that I'm using and will be probably my permanent solution (I'm not recommending to be your's permanent solution, but it will be mine's)
(PS: Gambiarra is a word that means what is supposed to be quick temporary fix that ends up being used for longer than that)
