Step 11: Putting it all together.
Once you have your cap; it should fit on the tube without the need of additional adhesives. If not, a bit of hot glue or similar should be sufficent. The collar should slip on and the weight of the assembly should keep it there. Again, if not, a bit of hot glue or a layer of electrical tape should provide the additional thickness required for a decent pressure fit.
Once those are both in place; start by cutting the two way splitter and wires down to a more managable size. You are just looking to excise any excess wire to take up less space. This may be an optional step, depending on the length of your wires. Once you have completed, or skipped, that step; connect the two-way splitter to the el-wire and inverter. Connect the inverter to the battery pack. Tuck all of this into the collar in whatever way works best for you. I used a bit of double sided foam tape to keep everything in place.
With that, you are done! Well done! Now, send me a link with pics! I'd love to see other people approach this. :)