eight.
a small, slightly oval-shaped metal pebble (mushroom pebble)
These rollers are offset, meaning their axis of rotation is slightly different. As a result, rotating them changes the distance between the sashand the fixed frame. In the summer position, the window closes normally. In the winter position, the sash is pulled harder against the frame, compressing the rubber seal and blocking even the slightest drafts of cold air. An ingenious mechanism, designed into the manufacturing process, yet almost no one talks about it.
The step-by-step method for adjusting your rollers
Good news: you only need one tool. In most cases, a 4mm Allen key is sufficient. You can find these in any large DIY store for a few euros. Sometimes, a 5mm model or a pair of pliers will do the job.
closure. The key point? All the rollers on the same door leaf must be adjusted identically. Otherwise, you
