I've been using rafter squares to square up cabinet casing. The ones I buy at the BORG are accurate for awhile but tend to get out of square quickly. Does anyone know where I can find a sturdy rafter sized square of high quality? I'm thinking the ideal tool would be designed like a carpenter's speed square (typuically max of 12 inches) but larger like a framing square (typically 16 x 24 inches).
rafter square and speed square: