Jack Gelfand Astronomy and Telescopes-Mirror Box

Mirror Clamp

The shaft collar is pushed up against the inside of the mirror box to limit longitudinal motion of the screw, but is loose enough so that the screw turns freely. Turning the wingnut screws counterclockwise pushes the clamp down against the mirror pushing the mirror against the webbing. Turning the wingnut screws clockwise raises the mirror clamp freeing the mirror to float in the webbing. The clamp is made of a solid piece of pine. The screws are 1/4"x20 socket head cap screws with press fit plastic wing knobs. The knobs and shaft collars are available from McMaster-Carr and other sources. See closeup view of the mirror clamp is shown on the next page.

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