I bought one of the ADM saddle plates that takes a D or a V dovetail - and it is very good. Nice and solid - actually seems more secure than the Losmandy saddle plate that came with my G11. The ADM ones have two clamps which holds the smaller bars better.
EDIT - sorry - just read you are piggybacking. In that case, I assume that the SCT has a D dovetail on the bottom, and the ED80 has a V dovetail on the bottom? You will need something on top of the SCT. The most solid way to do it is another upside down D dovetail with the ED80 rings attached to some D dovetail adapters that then clamp them to this upside down plate.
Adam
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