Ever try to replace your bars with the internal wiring in them, here's a tip to make your life easier.

Use a vacuum cleaner to pull a piece of string through the bars in the desired side and then use that string as a drag to pull in the wires or another wire that can be used as a drag if you want to pull the bunch through. You may need a bit of lubricant on the wires if it is tight, but be carefull not to chafe the wires going in. It would be wise to chamfer the holes where the wires enter and exit the bars.

Works like a charm and makes your life easier.