Right now I'm doing 4x5 contact prints onto 5x7 enlarging paper, and soon I'm planning on doing 5x7 contact prints onto larger enlarging paper (and eventually I would also like to try some traditional contact printing paper but enlarging paper has been easy and available).
I've been using a Proof Printer which has been good and easy - arranging the negative on the paper is a breeze and the glass is very heavy and keeps the two pressed firmly together, but I understand this is not the way things ought to be done.
Why use a more expensive and cumbersome contact printing frame?