FAQ

If you drop a carpenter square on a hard surface such as a concrete floor, it will easily lose its right angle. Don’t worry we have a solution. If it is under 90 degrees, try to hammer the inside corner of the carpenter square a few times on an anvil (gently!). Then the metal around the inside corner will expand pushing the blades outwards.

On the other hand if it is over 90 degrees, you can tap the outside corner. Then the metal outside will expand pushing the blades inwards.

More official Japanese carpenter squares have special scales on the back. They are used to work on a slope of a hip roof/half hip roof, or to figure out the maximum size of a post that can be taken from a particular log. We call these special scales urame in Japanese. When working with these scales, a square with the Japanese imperial is easier to use than the one with the metric.