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Editing Step 82 —

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We're getting pretty close to the end now! In these steps, we'll seal up the E-Chassis inside the main tube.

Start out by beveling the inner edge of the main tube using a medium grit sand paper so that the o-ring will fit in the tube without getting damaged. Wipe off all the dust left over from the sanding process when done.

BE CAREFUL NOT TO SAND THE INNER SURFACE OF THE TUBE WHERE THE O-RING WILL BE. THIS PART MUST BE KEPT COMPLETELY SMOOTH. ONLY CHAMFER THE EDGE!

Place a #153 o-ring (the medium-sized one) on the endcap that doesn't have wires passing through it.

Fit the endcap with the o-ring on it into the main tube and see how it fits. Because the tolerance of the main tubes is pretty loose, you may need to put several wraps of teflon tape around the endcap (underneath the o-ring) to make the fit snug.

Wrap enough Teflon tape around that endcap so that when it is inserted into the tube, about a 1mm wide band of o-ring is pressed against the side of the tube. You may need to put anywhere from 0 to 3 wraps of Teflon tape around the endcap depending on your tube to achieve this.

Since the o-ring will make a pretty tight fit with the main tube when pushed out to the right diameter, it is recommended that a lubricant be used on top of the o-ring (we like to use a commonly available lubricant called "MagicLube" which is available at many hardware stores) to assure the o-ring gets seated properly

Place wraps of Teflon tape around the other endcap (this is easier to do with the E-Chassis disconnected from the wire harness) then connect the E-Chassis, turn the ROV on to make sure everything is working properly, and slide the main tube down over the E-Chassis- makeing sure to keep wires from getting pinched against the tube as you go.