Mapping mouse buttons with udev hwdb

Following this guide: http://ift.tt/1t0IU1h

I've set up a config file:

$ lsusb | grep G500
Bus 006 Device 007: ID 046d:c068 Logitech, Inc. G500 Laser Mouse
$ cat /etc/udev/hwdb.d/70-g500.hwdb 
keyboard:usb:v046DpC068*
  KEYBOARD_KEY_90009=9
  KEYBOARD_KEY_9000a=8
  KEYBOARD_KEY_90006=0

Based on the following evtest output:

Event: time 1422711060.272136, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90009
Event: time 1422711060.272136, type 1 (EV_KEY), code 280 (?), value 1
Event: time 1422711060.272136, -------------- EV_SYN ------------
Event: time 1422711060.432134, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90009
Event: time 1422711060.432134, type 1 (EV_KEY), code 280 (?), value 0
Event: time 1422711060.432134, -------------- EV_SYN ------------
Event: time 1422711061.461191, type 4 (EV_MSC), code 4 (MSC_SCAN), value 9000a
Event: time 1422711061.461191, type 1 (EV_KEY), code 281 (?), value 1
Event: time 1422711061.461191, -------------- EV_SYN ------------
Event: time 1422711061.628125, type 4 (EV_MSC), code 4 (MSC_SCAN), value 9000a
Event: time 1422711061.628125, type 1 (EV_KEY), code 281 (?), value 0
Event: time 1422711061.628125, -------------- EV_SYN ------------
Event: time 1422711062.725119, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90006
Event: time 1422711062.725119, type 1 (EV_KEY), code 277 (BTN_FORWARD), value 1
Event: time 1422711062.725119, -------------- EV_SYN ------------
Event: time 1422711062.902137, type 4 (EV_MSC), code 4 (MSC_SCAN), value 90006
Event: time 1422711062.902137, type 1 (EV_KEY), code 277 (BTN_FORWARD), value 0

And yet I get no keypresses (Or change in evtest output) when I'm done.

(Yes I've done udevadm hwdb --update/trigger)