Step 1: Locate slots at the base of the cone. This will determine the cross-section of your O-Ring
Step 2: Select the appropriate cross-section slot into which your O-Ring fits.
Step 3: The raised numbers above the slot determines your O-Ring cross section size.
Step 4: Slide the O-Ring down the cone until it comes to rest on a step.
Step 5: Read the O-Ring size from the step it is resting on
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