Hi Peter, I just changed mine to side by side as well. I have a heq5 with a Celestron schmidt and a 80mm finder. What I used..
Bought William Optics (WO) large dovetail from Andrews. My 80mm had WO rings already and my C8 has 33cm dovetail with rings. All I did was screw the 80mm to the WO dovetail since the holes lineup on one end and drill 2 holes through the dovetail at the other end. I made sure the holes I drilled on the C8 dovetail was close to the balancing point.
Since the WO dovetail plate has mount holes all the way along the lenght, I can move each scope closer or further apart. It is not as elegant as a proper plate with sloding vixen attachements but they cost $400 plus. The WO plate cost me $99 and some 5mm bolts and nuts.
If you PM me your mobile I can send you some photos.
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