Broke mine (see here: http://gstwins.com/gsboard/index.php?topic=47402.0)
Looking for #17 on this diagram:
(http://i665.photobucket.com/albums/vv13/arosberg/Miscellaneous/SU0083_003.gif)
I have one I won't be using.
Thanks Charlie, I have an offer of one from Train. Hang on to yours. If I manage to break another, I know on who's door to knock!