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Editing Step 25 —

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Okay, this is the part where we attach the rear endcap to the battery tube and pot the channel system in between the two. This part is quite a bit of fun!

First, sand the inside of one end of the battery tube.

Don't sand both ends of the tube because the other side will need to be smooth for an o-ring to mate with.

Apply a thin bead of super glue along the rim of the sanded end of the battery tube.

Insert the aft (spring terminal) endcap into the sanded end of the battery tubes.