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Editing Step 20 —

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Place both endcaps into the main tube, and inspect to make sure that at least a 1mm-thick band of the o-ring is pressed against the inside of the main tube. Rotate the tube to make sure the o-rig engages along the entire interior perimeter of the tube.

VERY IMPORTANT: Because the tolerances of the pieces may vary slightly, it's possible that your endcap may not engage tightly enough with the main tube. (You can see an example of what this looks like in the second image).

If the endcap doesn't fit well, the band of engaged o-ring will be very thin or may even disappear in spots. If this is the case, send us an email at info@openrov.com with an image of your endcap in the main tube (like the images shown) and we'll make sure you end up with parts that fit.

Once you've tested the fit of your endcaps, put them in a clean place (like a zip lock bag) so dust and particles don't get on the o-rings.