Funny, but i use one by one as sacrificial beads the plastic doors of a McDonald restaurant i found near the trash Hard plastic filled with paper or fabric.

I tried aluminum bead and slowly i started f^^^ing it up. MDF did not work. But bolting sacrificial plastic layer/10mm in my case/ and fixing all the jobs except aluminum, with hot melt glue gun works best for me. Fast, cheap, easy to fix, reliable and easy to scratch and clean from the plastic bed, wood or plastic part.