You are brilliant! I have lots of cigar boxes (I got a great deal last year from the local cigar shop) and I was going to use small blocks of wood to hold the mandrels but the plastic canvas would be so much easier. I am going to an art retreat next weekend and now I know what I'm going to be working on.
Thanks for the great directions. I have made bead boxes out of cigar boxes in the past using fun foam glued on the bottom and sides and little partitions made out of basswood. Making them your way with mandrels allows many more to fit in the box (and eventually the basswood will break.)
Again, thanks for sharing.
Peg