Hi all, I'm trying to install a pull-out bin under the sink, but need about 1cm of extra clearence to enable it to fit. The under-sink pipework is blocking it a tiny bit. How does this all fit together? Would I be able to just release the U-Bend and fit a shorter one instead, or shorten the downpipe its attached to by an inch and then re-fit perhaps? Or maybe a job for a pro? Thanks!