This tip is from


Send for a FREE preview issue of ShopNotes today. Fill in the form below!

Sign Up for Free Woodsmith Tips

Learn More

101 FREE Woodworking Tips! Plus sign up for tips delivered to you by email each week

Our Advertisers

Online Tips Index / Assembly / Checking Diagonals

Checking Diagonals

Tape holder for checking diagonals Comparing the diagonals of a cabinet or a box is a great way to check it for square. But when you're working alone in the shop, measuing long diagonals accurately can be difficult. To make this job easier, I made a pair of simple tape holders.

Each holder is just a scrap of ¾″ thick plywood cut to 4½″ square. Two pieces of ¼″ Masonite 2″ × 4½″ are screwed to two edges of the plywood that make up a corner. Then, to hold the tape and allow for an accurate reading, the corner is mitered to form a slot that fits the blade.

R.B. Hines
Vienna, Ohio