Do you mean one of these :-
http://www.myastroshop.com.au/produc...asp?id=MAS-238
I have one I don't use, plus I have this bit as well :-
http://www.myastroshop.com.au/produc...asp?id=MAS-099
It extends the bit where the camera mounts for long skinny cameras or handycam type things.