I'm making a REAL workbench using a lot of mortise and tenon joints. Between the upper a lower stretchers I'm building in drawers with internal female drawer guides. Though it complicated things a lot, I wanted "through" drawers - accessible from both the front and back of the bench. Here's how I thought I was going to do it.
But then, in order to pick up more room, I moved the top internal drawer guides up as far as they could go.
UNFORTUNATELY, that put the internal drawer guides' mortises directly under a tenon above it which would attach things to the upper stretcher. And that meant that the tenon above snapped off during a test fit. OOPS!
NOTE TO SELF: DO NOT totally undermine a tenon with a mortise!
Here's what I should have done and how I fixed the screw up.