I have a aluminum track bike that did not come with cable guides for rear brake. Short of zip-tying the brake cable to top tube (which may rub the paint), what are my options? Steel housing guides I found on ebay are typically for small tubed steel bikes. I found Jagwire stick on cable guide part DCA007, but it is for hydraulic brake cable (6mm dia, instead of 5mm for mechanical cable). These may work but cable will flop around inside the loop. I would like to find a better solution. Any ideas, please help.