I bought this track less than a month ago, for a start the store sent the wrong track, ST-350 instead of ST-350M, but this is the problem of the store that sent the track. Scratches on the back of the display or I don’t even know what it is, but it can’t be removed, a crooked design that doesn’t allow you to tighten the bolts because the holes don’t match, something incomprehensible in the screws, some kind of white substance similar to soap, you see, God knows where it lay and how, tightly tighSee full review