good question ARKM. i noticed that the etch was more noticable on the side of the coathanger wire and i had to turn the shroud around afew times so i made a U shaped negitive so the etch would be even...Didnt make all that much difference because it was a further distance from the shroud,but in saying that if i had used a narrower glass jar it would work better.I even thought of trying a spiral of wire but never got around to it...i may do so in the furture though just to see if it works better.The car charger worked great though, much faster than the battery packs
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