The extension bar fit perfectly, had a chance to use it last night with a small scope on my Skyguider Pro, good product works well. The only complaint I have is manufacturers issue, you have to put weight on before you screw it into the main bar, or put weight on the slide it down ,as the end do not unscrew its fixed. But very happy with product

Without turning the original Skyguider Pro Declination bracket upside down, I couldn't get my RedCat and camera to balance. This was fine but turning the dec bracket upside down meant that the Polar Scope was always upside down if your rig was left in place so to speak, the William Optics extension bar has allowed me to balance my rig without adding an additional counter weight, maintain the declination bracket in its intended orientation and looks super cool as well. Highly recommend.