Remove the two screws holding the bottom section of the frame. There is one screw either side of the bottom section. Once these have been removed the bottom section can be prized away from the rest of the frame. Be careful not to lever against the glass or you could shatter it. When the bottom section is clear from the rest of the frame you will be able to remove the wheels. Some wheels have a screw holding them in and some are pressed into a holding bracket. If the retaining screws have rusted you can carefully drill them out, taking care not to make the hole in the bottom section any bigger. Contact your local Hardware Store, Glazing Shop or search on Google for replacement wheels.
There are also many styles of the patio door. Some patio doors are made using the French door design, where the single panel of glass is cut into several pieces. The door frame of the French door has mullions, the bars where the glass panels are attached. Using a French deck door still creates the same transparent effect, although with a little more elegance.Some deck doors make use of sidelights to create a more spacious look. Sidelights are door-length windows installed at either side of the door. They may only be windows but they also use glass panels, making them transparent and letting more light and view into the house. Sidelights may either be narrower than or as wide as the doors themselves.
Because slide-and-pivot doors have no hinges, there is no requirement for a sturdy side frame; its only purpose is to cover the gasket that seals the double glazed unit. This means that the views afforded through the expanse of patio doors have minimal interruptions. At the time of writing, there are two versions of frame-less glass doors available in the UK, both using the slide-and-pivot technique: one manufacturer supplies their frameless glass doors with kite-marked double glazed units which have a visible seal, the other uses an almost transparent method of sealing their double glazing. Contemporary by design, the absence of visible characteristics makes frameless glass doors a viable option for period properties.
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