I have already assembled several window locks and was affixed with relative ease. They make a solid impression. I therefore assume that in the event of the case do their job. Basically, the fuse is designed to be mounted on the handle side. Occasionally, however (or above.) Page is also mounting on the lower window specified. From my experience, it should be noted then, however, that it is only about a pivot window and not a rotary / Kippfenfenster during assembly at the bottom. The pivot point of the window when tilting übrerein not true with the pivot point of the fuse. This means that the window could be indeed completely open, but no longer tilt. The installation on the window top has no influence; is possible. Compared to the also built by me fuses FAS101 the FTS206 work something tight and "hakelig".