I have the basket after the first time assemble mined because it has very strong rattled and not SAHS firmly. This is partly due to my porter, who is one probably something bulkig, but such a basket should but sit really tight.
I have solved the problem with an advertising foam mat. Before I reassembled the basket I put the mat in between (see picture).
Now he is stuck really well and is additionally protected by Porter from rust. ^^