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CherryLOCK®  riveters have a setting control on the rear of the head assembly

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that is used to determine how flush rivet stems will break.

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Adjustments to this setting are required to install longer grip fasteners.

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The 680A159 gage is used to adjust the shift point setting

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and is included with the tool.

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Fasteners are categorized into groups A, B and C

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-determined by grip length.

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All Cherry double action riveters are capable of installing group A fasteners,

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but the G689 and G686B-S are the only riveters able to install B and C group fasteners.

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To adjust the setting,

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connect the tool to an air source.

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Remove the collet assembly and the pulling head.

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Then thread the smaller end of the shift setting gage into the head piston until snug.

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Press and hold the trigger so the gage is pulled into the tool head,

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and use the setting gage to identify the group for which the tool is set.

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If installing Group A rivets,

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Gage point A on the setting gage should be flush with the front of the tool head.

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Release the trigger and turn the adjuster knob clockwise to increase gage protrusion

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or counterclockwise to decrease gage protrusion.

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Cycle the tool after each adjustment and check the gage point until it lines up flush with the tool head.

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To install group B rivets,

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remove the limit pin and the adjuster ring.

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Then turn the adjuster knob six times counterclockwise.

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Replace the adjuster ring, making sure to align the friction spring with the adjuster knob.

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Turn the adjuster ring until the limit pin hole aligns with the rear cap hole,

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opposite of where the adjuster knob points.

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Then replace the limit pin.

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When adjusted correctly,

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point B of the setting gage will be flush with the front of the tool head

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while holding the trigger.

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When installing group C rivets,

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remove the limit pin and turn the adjuster knob twelve times counterclockwise from setting A,

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or six times from setting B.

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When adjusted correctly,

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gage point C will be flush with the front of the tool as the trigger is held.