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Thoroughly disagree that water is a suitable volume measuring agent.
It will not wet oily surfaces or fill all the inevitably slightly oily chamber without bubbles. Use liquid paraffin, which is equally hydrophobic/hydrophilic. It will wet oily surfaces AND wash off with water. Ordinary paraffin is just too smelly.
Buy liquid paraffin from a chemist(pharmacist) but be ready for rumours around town about your severe constipation.
John
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