I haven't had Domino joiner very long, but,I can't seem to make a simple box for a drawer.Sometimes the sides are not flush at the corner and sometimes there is a difference vertically. Do you know of any place that demonstrates in clear terms which faces of two boards are used to get an accurate joint? In other words, which face do you use to set the machine on?Also, holding the tool vertically to bore a hole in the board face is kind of hard to do, even with supplied rest. I respectfully seek your help.