Couldn't find one like it, and I found a thread like this to be invaluable on a home building forum.
Please share the best trick you ever learned in woodworking, either from a master craftsman or elsewhere. I'll start.
- How to cope an inside corner, and spring the moulding in place. You'll never have a cracked joint.
- When diagonals are equal, the four sided polygon is square (provided it isn't a trapezoid).