A 75 mm diameter circular metal disc with 12.5 mm central aperture. A screw controlled spring loaded precision slit is mounted on one side of the disc. Max opening 4 mm wide and 10-12 mm long.
A 75 mm diameter circular metal disc with 12.5 mm central aperture. A screw controlled spring loaded precision slit is mounted on one side of the disc. Max opening 4 mm wide and 10-12 mm long.
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A 75 mm diameter circular metal disc with 12.5 mm central aperture. A screw controlled spring loaded precision slit is mounted on one side of the disc. Max opening 4 mm wide and 10-12 mm long.