One piece of the stand for these TV trays was drilled too deep, so it could not be tightened where it belonged.  I called and asked for that piece to be replaced. I got the wrong part.  I called again, and asked that they send me a whole stand.  I got one vertical, and again the wrong cross piece. When I called the third time, the girl said she was just going to send me a whole new set.    We were able to just take out the piece we needed, and complete the original stand.  I could not understand when we were identifying the part number, that they couldn't just send that.