Aiming headlights 1st gen

I actually never aimed the headlights before on 3 Explorers I had....
The manual I have is crap & says nothing about it.
I found the up/down adjuster, but how to I do left & right?
I think I found it, it's the same type of hex type thing on the side of the housing, but how do I get a tool in there to adjust it? Which way is left & right?

Thanks

 

[mattadams]

They actually make a tool designed to get in there, though I don't think I've ever had a vehicle that actually needed left/right alignment... but this is the one I've got...
http://cgi.ebay.com/ebaymotors/LISL...Z260758232034QQptZMotorsQ5fAutomotiveQ5fTools