I have a Sky-Watcher Esprit 150mm refractor that i would like to attach a second telescope on top of this so i can use both scopes at the same time. I purchased a Evostar 72mm scope that i would like to mount on top of this larger OTA. I have never done this and would like to know how you go about doing this. The 72mm has a short Vixen style dovetail plate and there are holes in the top of the mounting ring on the 150mm to attach something. This is where i have never gone before. Any help would be greatly appreciated.