Hi Gilles
Believe Grant is correct on direction,to be sure I'd have to go out to the shop and try one on each side.
The bigger problem is the HUB NUT the one on the left side is normal thread "righty tighty lefty loosey" which means it will try and sometimes be successful in loosening itself.
See
http://www.mapleleafup.net/forums/sh...ht=loose+wheel for old thread on what can happen.
I now paint mark the hub nuts so I can tell at a glance if they have moved, buy removing the hub cover.
Cheers Phil