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Just to add further to Steffen's remarks, the GSO Alt bearng are real steel roller bearing assemblies and very smooth and the resistance is easily controlled by the large knurlled nobs. I have disassembed them in he past to add encoders, which is not hard to do, and can vouche for the quality. The tube balance slider is graduated to insure bilateral accuracy and is easy to adjust but the tube has to be out of the base to do so. Some people like to bag GSO scopes, (but never their owners) as but they are the best value performers in the market and mirror qualiity is outstandng - for their price.
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