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Hi Daine, congrats on your new set up mate. Your mount will hold your scope, camera and a guide scope with no problems at all. I have the same mount as you and I have an 8" reflector, with a 4" guide scope, two cameras, dew controls, straps, cables and finder scope all hanging off it and it has no problems.
As mentioned above, flexure and dew control are really the biggest issues you will have to face with a guide scope. flexure is just a matter of making sure brackets etc are strong enough and the two scopes are solidly fixed to each other. There are some issues with using an OAG as well. If your focuser isn't strong enough you can add sensor tilt because the focal train becomes longer and sticks out further, therefore your focuser may droop because of the extra leverage the camera weight has on it.
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