[HELP] Edgewick Light Type Lathe help

[tekfab]

Hi Dan, i would guess that they're behind that cover on the left hand side, perhaps you could remove it and post a couple of pictures of what's in there ?  I'm guessing that if you haven't found a lever that operates them then there might be a mechanism in there to engage/disengage them but let's have a look anyway, nothing ventured . . . . Having just had another look at the first picture is that a lever where the two exposed gears are ?
Mike