Do not glue the crystals in the pipes. After it has rained on your CB, the pipes will fill in with water and the inside will become murky. This design allows you to remove the crystals, and clean them every now and then.
Its is quite possible that the copper wire does enhance the output, but I have not checked to verify this.
The other advantage of this system is that the crystals will go in last. You may find that resin may have dripped in the pipes if you have not been carefull.
So make sure to cover the top of the stubs with small plastic bags held with rubber bands, so nothing falls into the pipes during construction.
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