For the OP, I am using one of these
http://www.bintel.com.au/Accessories...oductview.aspx
With one of these
http://www.bintel.com.au/Accessories...oductview.aspx
You just need to check the threads to ensure the adapter is the right one. I actually started out with the SCT diagonal and as posted before it was a royal PITA so I got the adapter and a 2" nose for the diagonal to convert it to the refractor style. One of those occasions where I was given advice and did not take it! Bintel did reckon that the way I am not set up is the easiest way to go.