My setup is-
T-ring to one of these:
http://www.bintel.com.au/Astrophotog...oductview.aspx
then a 50mm spacer like this:
http://www.bintel.com.au/Accessories...oductview.aspx
then the barlow into the focuser (I think, I haven't used it in a while, I may have the extention tube after the barlow but I can't remember).