Here is a shot of my piggy backed setup.. everything is solidly bolted down so there is little to no chance of flexture..
What I have is the dovetail bolted to the imaging scopes rings, Another dovetail bolted on top of the imagers rings. I have my guide scope bolted hard to that second dovetail by means of the guide scopes L mount... This setup is extremely rigid, and guiding out to 20 minutes has not been a problem..
I agree with Andrew.. Steer clear of adjustable guide scope rings. They are a constant disaster in my experience.. Mount everything as solidly as possible. This will ensure that at the end of your nights imaging, your hair is still on your head, rather than strewn across the ground..
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