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The ''spoon filler'' owes its name to the shape of the bar used to compress the tank, which is similar to that of a spoon. In this case, the pressure is exerted on the enlarged end of the spoon, which is accessed by unscrewing a blind cap placed on the bottom of the pen barrel. The bar is properly hinged to the bottom of the barrel, so that the pressure on the ''spoon'', moving the internal section of the bar, causes it to press on the sac.
The ''spoon filler'' owes its name to the shape of the bar used to compress the tank, which is similar to that of a spoon. In this case, the pressure is exerted on the enlarged end of the spoon, which is accessed by unscrewing a blind cap placed on the bottom of the pen barrel. The bar is properly hinged to the bottom of the barrel, so that the pressure on the ''spoon'', moving the internal section of the bar, causes it to press on the sac.
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[[Image:SpoonFillerSchema.svg|center|500px|Diagram of a pen with ''spoon filler'']]
[[Image:SpoonFillerSchema.svg|center|500px|Diagram of a pen with ''spoon filler'']]