Grant, you could try the Hogg's plastic squares. I do this, and while it
does cost a bit more, little fingers can't get inside the plastic
cassettes. Here are some pictures of mine

http://www.pbase.com/beekeeper/image/22424566

The biggest drawback that I have is that they weigh in at 1.5 pounds (it
varies) and if I sell them at 5 dollars, I make a buck profit less than
with my regular bottled 1.5 pound jar, and when I offer them for 6
dollars, they don't sell. So I stopped doing them, but some guy this
Saturday offered to pay more if I custom produce them, so we'll see what
happens.

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