Doors look strong from outside. They feature glass, frames, locks, and handles. The true hero, however, is only a minor character. That’s the hinge. A hinge supports the door, bears its weight, and allows it to open and close every day. When hinges are weak, the whole door feels bad. It makes noise, drops down,…

Sliding doors look simple. You push them, and they move. But everyone who makes, installs, or uses sliding doors knows one thing. When the door does not move smoothly, the problem is almost never the glass or the frame. The real problem is usually hidden at the bottom. It is the roller. Adjustable rollers are…