Hey guys,

I'm having a bit of a problem with the design of the langstroth. The carpenter I'm working with is having a problem getting the notches in, you know those square bits on the edges of the four corners where they pop into each other? He doesn't seem to know how to create those. Any suggestions?

They're circled in red here:

DISCLAIMER: The photograph is not mine, I just found it online. This was the best example I could find and I apologize to whoever the picture belongs to.