Compared to the description of your paper cutter, mine is a cheapo.
It’s a 12 inch Boston brand, if I remember right, it cost about
$30.00 at an office supply store.
To keep the piece of metal from moving when it’s sheared, I some
times place a piece of rubberized web between the metal & paper
cutter bed. The web is sold in the household dept. of many stores (Wal
Mart etc.) to line kitchen drawers & cabinets to prevent dishes etc.
from sliding. The web doesn’t have to be the full size of the metal.
Often, a smaller piece will work. When using the web, line the metal
up against the front edge of the cutter bed, then press the metal
against the web firmly while cutting.
Works for me.