Review on Upgrade Your Telescope With Astromania'S Adjustable Guiding Scope Ring Set - Perfect Fit For Diameters 63 To 89Mm by Chris Sandridge

I've looked at several of these from various manufacturers in the past and have been disappointed in their generally flimsy design and construction. However, this one from Astromania is excellent! It is both compact and robust, and very well made-- all machined surfaces are smooth and flawlessly coated. The adjustment screws are large and easy to grasp and turn. The soft tips of the adjustment screws securely hold the guide scope without marring its surface. The guide scope is held securely enough that accidental bumps won't necessarily throw off the pointing. Definitely the best example of this device that I've found. And at a very reasonable price!