Paraphrasing my last read of the fitting instructions:- "Fit the wire in first clamp and route over the bar then under the stem so the bag hangs as required then trim surplus off" so depending on the cutters used it will be a mm or so proud and out of the way at bracket edge as snips won't quite go flush, I cut it much longer (for another fatter barred bit) and poked it back into the bracket, though it can just hang loose of course. So did you clamp it tight and remove it all to trim to the splayed bit? not realising difficulty to rethread it? Figure of eight around the stem stops rotation upwards but hardly essential, let's face it all the crap in the bag makes the bag a gravity well... New cables are available in varying lengths.