Oh, regarding the "white border", give this a try:
Tape the negative to the underside of the glass(so it's in contact with the paper, like normal), then use BLACK ELECTRICAL TAPE on the top part of the glass, to act as a mask for the edges. I've done this for 8x10 contact prints, but never for 5x7(most of my 5x7 has been color, so I've been drum scanning it).
So you get nice, evenly spaced lines, draw w/ a fine-point sharpie the lines for the determined "print" size, then put the tape down along that line, so you get it nice and straight.
-Dan
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