Chris here you go.
The top left hand corner Magnets are most important, you set them just outside the image area and they are braced.
You roll up the paper and put the top right corner into the angle formed by the Magnets, they should be braced by a smaller magnet behind so they do not move and you can set up your neg once and keep printing until the neg is finished.
the holding magnets are smaller and you can see that you set them up on all four sides and ends and they are just outside of image area.
When exposure is done you take the right hand magnets off first and roll to the left taking off the magnets as you go but you do not move the main magnets from the left corner.