Perfect Circle. M.Power's Flat Lying Trammel Heads have a pivoting point for fine adjustment and come with pencil and knife attachments. They clamp to thin rules, squares, and drywall shims and lie flat on the work surface for easy operation — though they won't fit thicker aluminum rules and drywall T-squares. One or two heads can be attached to a try square or combination square to draw or cut parallel lines. The tool costs $20. M.Power, 613/525-3328.

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