What I like to do is get a length of the pull chain like you'd use for a ceiling fan, and attach a small nut on the end of it to act as a weight. The chain is very flexible as you know, so it flows through the bars easily. Once you fish the chain through the bars, attach your wires and pull em back through. I've used this trick several times with great success.
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2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner