Scroll ball mouse in Bookworm/wayland

How can one get a scroll-ball mouse working in Bookworm/Wayland
on a Pi5?

I connected an old Apple mouse with a scrollball on top and found
that it worked nicely to start with, but after a few updates scrolling
down a page quit working. Left-right up a page still work.

I'm  trying the instructions in
https://gist.github.com/eli9000/ac3356bb2d40183be1a425805e3b7641
but the file layout doesn't quite match and so far my efforts
to edit the sytem defaults haven't worked.

If there's a simpler way please point it out!

Thanks for reading,

bob prohaska