Mine broke on my 2008 at 17,000 miles. The mechanic has a 2006 ZX-6R Ninja and his broke at the lever too. The ferrule with its chrome sleeve is hard to extract from the lever, but if you set the adjuster at 5 you'll be able to get it out. I have the official shop manual and this is not mentioned. We should probably lube them every 2 years but you should know that this job takes a good hour after you remove the front tank and back rear covers, extract the old cable, lube the new one, and position it through its 3 wire loops.