A window can lock firmly and still leak. It can also seal tightly while remaining easy to pry open. This engineering guide separates window lock security from window weather sealing, then shows where the two systems interact.
Window lock names are often used loosely, but the mechanisms are not interchangeable. This guide explains how sash, cam, crescent, espagnolette and multipoint locks work, where each type fails, and what buyers should verify before approving hardware.
A sliding door handle should never be selected by appearance alone. This engineering-led guide explains how panel weight, usable stile width, roller resistance, handle projection, mounting strength, and lock geometry determine whether a handle will operate safely and survive repeated use.
Flush, recessed, and surface-mounted sliding handles solve different mechanical problems. This guide compares their grip, projection, installation, accessibility, structural demands, and long-term risks so architects, manufacturers, and hardware buyers can specify the right handle before approving samples.
Casement window handles are not interchangeable simply because their levers look alike. This technical guide compares cam, espag, fork and spindle-drive handles, exposing the measurements, interfaces and failure risks buyers must check before ordering.
A replacement uPVC door handle must match more than its colour and backplate shape. This guide explains how to measure PZ centres, screw fixing centres, spindle dimensions and the other specifications that determine whether a handle will actually fit.
A fork-drive handle and a square-spindle handle may look almost identical from the front, yet their rear interfaces operate completely different locking systems. This guide explains how each mechanism works, what to measure, and how to avoid an expensive compatibility mistake.
A replacement window handle can look identical and still fail to fit. This guide explains how to measure spindle length, screw centres, base size and projection without relying on the dangerous word “universal.”