The utility model relates to a fixing sleeve, which is a common component, and can be fixed on a cylindrical mounting surface. The attachment is easy to install and does not need to be fixed by other means. When the sleeve is fixed on the optical axis, the bearing can be fixed at any position on the shaft. When the utility model is used on the step shaft, the utility model can be used for fixing the bearing more accurately on a given position of the shaft, which is convenient for the installation and the disassembly of the bearing.
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