First, they sent you another carrier because they don't have a hardware store in their warehouse to just send you the parts. And besides, they have so little invested in that cheap Chinese product, they can send you another easier!
Secondly, I am not sure why you are praising them. They created a second customer service issue (charging you shipping for the replacement part) while solving the first customer service issue. How many times did you have to contact them to get the whole thing straightened out?
Not sure, but I think it would have been easier for you to just go to the hardware store and buy 4 nuts for less than $1!!!!!!!!
