One star deduction because the connections are different than in the instructions. Just laziness. It was easy enough to understand. I suggest you warm a cup of coffee with water for a few minutes. Submerge the coupler/connectors in hot water and slide on. For the part that connects to the part of the syringe (where you suck), heat the clutch and then put it on a thick handle or something to stretch it first. It works and works well once assembled. However, you need almost 2 people to use it.
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