You being in Australia and all, another way to do to the 19mm side is to get a bolt and nut setup. I don't know the metric equivalent of this Tech Vault piece:
"Take a 1/2"X 1 1/2" or thereabouts bolt, thread a couple of nuts on, tighten them really tight, (use some red locktight if you like), and you have an axle tool to use with a 3/4" socket. 1/2" bolt works because 3/4" and 19mm are so close, there's really no difference."
Maybe a 13mm nut will be 19mm OD? I'm sure there's something along those lines you could use. Anyway, cheaper than buying a 19mm hex head socket or allen wrench, even if you could find one.
