I use the Vello T-mount adapter:
http://www.bhphotovideo.com/c/produc...t_adapter.html
Gives me a perfect 55mm spacing from the Sony NEX-3 sensor to the TV 0.8 FR once the TOAG width is accounted for. I also use my CCD with it, and with the filter wheel and OAG I require no additional spacers. At the OAG end, I use a 5mm spacer for this setup.