Hi,
I read about it on the bigcoupe.com web forum, the particular thread is
http://bigcoupe.com/phpBB2/viewtopic.php?t=1129
The owner posted there.
Good luck with your 6er, they are fantastic once you get them right, I've got a few cosmetic things to do on mine, got pretty much everything else sorted out.
Cheers,
Iain.