I always pivot it properly like advised in this link :
http://www.network54.com/Forum/234649/message/1051110594/Proper+way+to+pivot+a+Grande+Reverso
...but there are very visible scratches in the case.
It seems to me that when pivoting the case, the "steel balls" are damaging the carrier when pushing it in.
Here's where the visible scratches are (scan):

Hope my explaination was correct!