Recreation : Logitech "gamer" mouse M-U0007

I found one of these old USB "laser" mice in a thrift store for 1€50 and couldn't resist... the one I use on kid2 still has a rubber ball and is pretty old (though it still works).

Anyways, this mouse species has many more buttons and I wanted to try to customize some of them.  So I found a question with the answer at Ask Ubuntu and tried it... with this:

luc@kid2:~$ head -10 .xbindkeysrc 
# For the benefit of emacs users: -*- shell-script -*-
###########################
# xbindkeys configuration #
###########################
# PageUp / PageDown by pushing the wheel left/right.
"xte 'key Page_Up'"
b:6
"xte 'key Page_Down'"
b:7