An apparatus for supporting UHV modules and attaching accessories thereto without welding and without obstructing any conflat ports includes a bracket attachable to an attachment feature without loss of vacuum. Embodiments permit arbitrary UHV module reorientation. In some embodiments, a supporting circular groove or series of groove segments is provided in the UHV module, and a clamping bracket fitted with holes meeting optical bench standards is attached to the groove by clamping two clamp segments together while fitting a tongue firmly into the groove. The supporting groove can be located in an extension terminating in a conflat flange, or in a separate UHV extender module. In other embodiments, the attachment feature is a plurality of threaded mounting holes that are not associated with conflat ports, do not require enlargement of the UHV module, and permit attachment of brackets without obstructing any conflat ports and without loss of vacuum.
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