The center square enables you to accurately locate the center of a round stock. Press the center square firmly against the side of the round stock and inscribe short line. Then rotate the center square approximately one third of the circumference of the round stock and mark a second line, intersecting the first.
For accuracy the tool should be rotated once more and a third line made. The center of the work is indicated by the intersection of the lines. The same tool can be used to mark diagonals on square stock.
Center square version 1
Center square version 2
CENTER LINE FINDER
Center line finder enables you to accurately locate center (middle) line of a board (edge, face or end). It’s very handy for marking the center of board edge when you’re laying out mortises, holes for dowels, centering biscuits, and doing plenty of other operations.
Center line finder - Version 1
Center line finder - Version 2